Removing Catalytic Converter O2 Sensor

When you remove the catalytic converter, the rear O2 sensor will see higher temperatures and greater unburned fuel flow. Often, the only way to tell if a catalytic converter is malfunctioning (plugged) is to remove it and check the change in engine performance. The more easily an engine functions and the less work it has to do results in less friction, less load and, ultimately, a lower operating temperature. Removing the catalytic converter will cause the vehicle to not run. My cat substrate was very clean, btw (don't know if it was previously gunked up, because I ran lacquer thinner before removing it). My wife's car has the check engine light on and she was told by her mechanic that it was the catalytic converter going out, to ignore it. Cleaning the sensor did not work for my truck though, which is throwing a rear O2 code. Remove the upstream and downstream O2 sensor connectors: this is optional, but depending on your vehicle it may be a good idea to keep the sensor wiring safe from an accidental burn. Question: Why Does Removing The Catalytic Converter Cause A Backfire, I know some people that removed their catalytic converters (illegal and not capable of passing emission tests I know), and the car immediately became capable of backfiring. The second sensor is under less presure of course. This could be due to multiple scenarios however, I'm running the EMS. If the voltage of the downstream O2 sensor is constantly jumping between 0. Just reading the details on the link Peter provided sounds very much like the problems that happen when shrapnel from the catalytic converter break off and enter the engine cylinders I wonder what their "fix" is - a replacement convereter or complete removal of it (and replace it with a length of straight-through piping)? ---. Took it to a Ford dealer and they replaced the intake manifold gasket. Best Catalytic Converter Cleaner All of us know the huge problems that the world now faces from global warming. PO420 or PO430 CODE CATALYTIC CONVERTER FAILURE DIAGNOSTICS. I am chasing down codes P0420 and P0430. This refers to a trouble in the Bank 2 Sensor 2 of the O2 (oxygen) sensor, which is located near the backside of the exhaust, behind the catalytic converter. By temperature? I was watching some videos on Youtube (learning how to replace a knock sensor, yay!), and happened across a video ( CO2+H2O. My cousin has a 2001 Nissan Maxima and the car has had the CEL on for a while because of the P0430 code. i finally figured out that the o2 sensor is whats causing the. The dealership confirmed it's the catalytic converter (front and rear apparently ) My 2000 SR5 has about 147,000 miles on it and I believe at least one O2 sensor was replaced prior to me buying it a month ago. I've had the P0420 code for over 5 years now. O2 Simulator Mini Cat Cel Fix, Big Daddies Garage Mini Catalytic Convertor Rear Oxygen Sensor Simulator is the best and easiestway to clear p0420 / p0430 codes for bad or missing catalytic converters. My cat substrate was very clean, btw (don't know if it was previously gunked up, because I ran lacquer thinner before removing it). Sensor 1 is the O2 sensor that is located before (upstream) of the catalytic converter or also called the pre-catalytic converter. The O2 sensor monitors the amount of unburned oxygen in the exhaust and produces a voltage signal that varies from about 0. This specific job was done on a 2003 Honda CRV. Use that same O2 sensor socket to remove the front O2 sensor, which is located at the bottom of the exhaust manifold, and the top of the pipe to the catalytic converter. If the catalytic converter is working as intended, the upstream O2 sensor reading should reflect a fluctuating graph, which represents the engine switching between lean and rich mixtures. Remove old catalytic converter: some catalytic converters are screwed to the exhaust pipe using two bolts on each side, while others are welded. Often, the check engine light will come on to provide ODII trouble codes to check with a code reader. Take a look at the upstream and downstream O2 sensor readings. Remove the one in the top of the catalytic converter as well as the one below the two bolt flange where it bolts up to the exhaust manifold. The DVOM can be used to check voltage and ground signals for the O2 sensor circuit, as well as resistance of the O2 sensor in question. Loosen the 12mm bolts holding the manifold heat shield. O2 sensor is locationed at outlet of cat. When the signal from the O2 sensor is detected by the PCM as being stuck lean or biased lean, this DTC is set. A catalytic converter is essential to your vehicle’s emission system; it functions by transforming "raw" exhaust into less environmentally damaging gases. The rear heated oxygen sensor, after three way catalyst, monitors the oxygen level in the exhaust gas. O2 sensor is used to accurately set the air fuel mixture, you need to have one in good working condition. rear exhaust system and remove front damaged while removing and installing exhaust system with catalytic converter (158) catalytic converter (158). When the ECU sees the signal from the rear O2 sensor is similar to the front’s, a trouble code P0420 will be set and the check engine light will come on. Removing a 5. I could be a failing O2 sensor as well, running the system to lean or rich. As for the catalytic converter, you cannot directly clean one while it is still on the car, because anything that is safe to run through the engine will be converted to CO2, O2, and N2, none of which will do any cleaning. By freeing up the manifold first, you can get to the three studs at the back of the catalytic much easier. On the exhaust side, these are oxygen (O2) sensors, which detect how much oxygen is in the exhaust, and tell the computer how lean or rich the. So it goes o2 sensor, drilled out non fouler, regular non fouler, cat. O2 Simulator Mini Cat Cel Fix, Big Daddies Garage Mini Catalytic Convertor Rear Oxygen Sensor Simulator is the best and easiestway to clear p0420 / p0430 codes for bad or missing catalytic converters. What the mechanic is not telling you is that it might just be a malfunctioning sensor, or the catalytic converter may be full of crud. Catalytic converter removes about 90% or more of the harmful emssions. I was told many different things by various mechanics as to whether or not it is advisable to remove the failed cat and run it without one. possible to clean out catalytic converter without removing it? on my 94 civic vx the catalytic converter is built in with the exhaust manifold and the upstream o2 sensor is right there as well. If it does, than you will need to get a sensor simulator, so the ECU will have a right reading all the time. No need bypass sensor / retune etc. Catalytic Converter and Oxygen Sensor Cleaner. Take a high impedance digital multimeter and attach its negative lead to the output of the sensor while still connected with the car control computer during the testing. There's one in the normal position between engine and catalytic converter, and another behind the catalytic converter. The O2 sim has an output signal wire that will replace the O2 sensor's signal wire to the engine control module. Some of the processes seen here are specific to this exact vehicle application. The threads on your spark plugs match the threads on your oxygen sensors, thus the sensor will be able to thread into the back of the defouler. Free 2-day shipping. And it will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high. Place onto the sensor and start turning. Not sure how is it on yours, but on mine it is before cat converter, so will not make much difference. I still wonder, and I have read somewhere do we actually need the backpreassure. Replace nuts (11/3). Just cut and replace. For example the O2 sensor is too sensitive. The O2 sensor behind the first catalytic converter is bad and he said that that was where the exhaust was getting caught up. Step 4 - Remove catalytic converter from head pipe (or buy one) The catalytic converter on the Harley Davidson Touring bikes is contained within the header collector pipe, with no easy way to get to it. Step 5 - Remove the O2 Sensor. This time it was bad rear O2 sensor. If you are still willing to take risks for a few notches up in the performance meter, follow the procedure to take the component off from the exhaust system: Unhitch the O2 sensor: The first step is uncoupling the O2 sensor. If you want to take it a step further, remove your pre-cats (if your car has them) and also remove the stock airbox and get a K&N air filter (or aftermarket intake) as well. There are two oxygen sensors: one is upstream of the catalytic converter and one downstream of the catalytic converter. A week later cel came back on. But you then have to deal with o2 sensor issues. A healthy converter will use a lot of oxygen, and so the rear oxygen sensor will see that there is little oxygen coming out of the back of the converter. Remember, the catalytic converter itself wasn't bad, it was the threads, where the oxygen sensor screws in. hi to everyone,i'm proud owner of 97' Infinity QX4 i looked under the car and there's no rear oxygen sensor so i'm wondering if i remove both of the catalytic converter (since i don need to pass emission in my counrty) would i have any problems with the ECU and probably CEL on. unknow wrote:Hi, I'm just wondering if I removed catalytic converter from the exhaust would I have a CEL on?I'm thinking doing custom exhaust for my alti so if won't give me CEL I will remove the cat for better performance perhaps?. This is a real mini catalytic converter. Once the cat is removed, unscrew the front O2 sensor from the cat, this is important, as you will see in the next step. Its techically illegel to remove the cats-but unless your state has inspection no one will really know. This specific job was done on a 2003 Honda CRV. Hydrocarbons or unburned fuel are potential factor for CC failure. $3 O2 simulator fix for P0420 Check Engine Light Once you verify from the o2 sensors that the catalytic converter isn't functioning efficiently, I show you how to modify the downstream sensor. i have a 2007 dodge charger R/t AWD and i noticed my gas mileage went from getting over 300 plus per full tank to not even 200. But you then have to deal with o2 sensor issues. This is a classic sign that your catalytic converter is starting to fail. (It's still tight, but manageable) 2. MY POINT being that P0420 can mean a lot of things, and a lot of times the other checks won't even run until the first problem is resolved (O2 sensor was also bad but I didn't get a code for that until the leak was fixed). Bypassing an oxygen sensor--also called an O2 sensor--can only be done using a dummy O2 sensor. While "cats" have been on vehicles since the mid-1970s, many people don't know what to look for when a catalytic converter breaks. Well I've heard that a clogged cat can also cause the same code to pop up. Obviously, both camps can't be correct. If you want to get the most out of your vehicle, this PaceSetter product is second to none. Our mini oxygen sensor converter can only solve the Problem of P0420 codes-faulty Catalytic converter. You can get around this by fitting a spacer on the downstream lambda (O2) sensor. Replied by NissanMaxx on topic P0430, o2 Sensor or Catalytic Converter?? OK, well I decided to just go ahead and buy the new cat anyways. catalytic converters do fail but the fault code is set due to rear O2 sensor value(s) being out of line. My Pathy threw a P0420 yesterday. You can remove the O2 sensor completely and replace it with a threaded bung (metal threaded cap) by turning the sensor out of the pipe with a wrench and then by threading the bung into the hole. If its B2 S2 that means Bank 2 (opposite Bank to Bank 1) and the downstream after cat o2 sensor. The O2 sensor is always a good idea to have. This O2 cel fixture with a miniature cat will make your ECU think the inventory catalytic converter is still installed. 1 - The role of the Oxygen sensor The o2 sensor (oxygen sensor) is located within the exhaust system, upstream of the catalytic converter. Beside pollution control it's beneficial in my opinion. On the exhaust side, these are oxygen (O2) sensors, which detect how much oxygen is in the exhaust, and tell the computer how lean or rich the. I was told many different things by various mechanics as to whether or not it is advisable to remove the failed cat and run it without one. Leaking fuel injectors–That dumps fuel into the cylinders and then into the catalytic converter, causing overheating. $60 on a bank 2 primary O2 sensor, $175 non OEM catalytic converter, and another $60 on a secondary O2 sensor. Find Your Oxygen Sensor To find the correct oxygen sensor that is guaranteed to fit your car at an unbeatable price, use the Year, Make, and Model search at the top left of this page. P0430: Catalyst System Efficiency Below Threshold (Bank 2) The P0430 check engine light code, like P0420, means the catalyst system efficiency is below the required threshold. RE: REmoval of Catalytic Converter IP: Logged Message: i have have a 97 3. So it goes o2 sensor, drilled out non fouler, regular non fouler, cat. If the catalytic converter is breaking HC, CO, and Nox into their component parts, the downstream oxygen sensor will display a constant voltage. He goes over how to remove an old, failing catalytic converter, and install a brand new Magnaflow replacement catalytic converter on many vehicles. _____ 1982 Vanagon Camper with ALH TDI conversion. A lot of people say that the exhaust size effects back pressure, which is of course true - but. Because they engineered the engine with the back-pressure from the Catalytic converter in there. What's driving the issue is that everyone wants the cause of the P0420 to be a bad oxygen sensor so they don't have to replace the. Bi-directional scan tool O2 sensor test. Actually there is a code specifically related to a bad catalytic converter. Pictures of reference material:-- This is an overview of the oxygen sensor components from the shop manual Toyota Echo: How to change post catalytic O2 Sensor Page 2 of 18. This may very temporarily change the firing conditions of the engine and clear the check engine light, however if the O2 sensor is bad or the CAT is bad the problem is just going to come back and very quickly. My WJ passed Roadworthy 3 months ago, without cat, with no inspection of the system being installed or not. The car sounded like it had an exhaust leak as well. The post-converter O2 sensor is located in the exhaust pipe after the catalytic. Step 1 - Removing the Sensor. This time it was bad rear O2 sensor. So it goes o2 sensor, drilled out non fouler, regular non fouler, cat. This tells the computer how to adjust itself based on the amount of pollutants leaving the cat. Remove the grommet and gently pull the cord, as show in the pic above. If your truck is a 1996+ and you remove the catalytic converter, since there is a pre cat and post cat sensor, the ECM/PCM sees no difference between the 2 sensors outputs and turns on the SES light. This O2 cel fix actually has a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. If you are still determined to remove the Catalytic converter, then you will have to take off the O2 sensor. As noted, it is against the law and you will need to trick out the rear O2 sensor. My dads car is not in the scope of the Vin numbers mentioned but still has the factory catalytic converter. Most cars these days also have a second sensor behind the catalytic converter, which looks like a metal cylinder on the exhaust line and is found right behind the front wheels. O2 sensor is used to accurately set the air fuel mixture, you need to have one in good working condition. Hi, just FYI but I updated the thread title so it would be more visible if people are searching for related information regarding the catalytic converter, P0420, P0430, and diagnosis. Removing the cats WILL trigger a check engine light because the O2 sensors are seeing the same levels of emissions, which makes the ECU think the catalytic converter has failed, so it triggers a CEL (check engine light) to get you to get it fixed. Welcome to the 21st century of o2 simulators…. The post-converter O2 sensor is located in the exhaust pipe after the catalytic. Well with my understand the catalytic converter put back pressure on the motor which in turns reduces the horsepower and fuel mileage, because of extra amount of work the engines needs to recycle the already burned gas. Recently my check engine light came back on with the same code, and I looked under my hood and it looks like they replaced the one after the catalytic converter. Do not remove Catalytic converters, these devices are present for a very good reason they reduce pollution by converting harmful emissions to safer emissions, if you remove a “cat” you make your car pollute more, more harmful to people and the env. The P2271 DTC refers to downstream sensor (after the catalytic converter), sensor #2 on bank #1. Diagnosing a plugged converter is fairly easy, but diagnosing converter efficiency requires tapping into the OBD II system with a scan tool to check for codes and to. If its B2 S2 that means Bank 2 (opposite Bank to Bank 1) and the downstream after cat o2 sensor. Oxygen sensor 1 is the upstream oxygen sensor in relationship to the catalytic converter. My point is that a lot of people throw P0420 into Google, see the word "catalytic efficiency", and automatically assume the cat is bad, or the o2 sensor is bad. Weld bung and plugs was easy to weld and offer fantastic value for the user. Removing and or gutting cat will not affect your mileage in anyway shape or form. Reports where it worsens running conditions are likely if the sensor is bad or old. Hi, just FYI but I updated the thread title so it would be more visible if people are searching for related information regarding the catalytic converter, P0420, P0430, and diagnosis. The converter's job is to reduce emissions out the tailpipe. • Restore the exhaust system by creating a straight pipe to facilitate. I managed to get the O2 sensor off and the 5 bolts holding the cat in place off. The 2 Downstream sensors were a bitch to get out, and I actually had to run a Thread Tap through the holes to allow me to put in the new sensors. These methods for bypassing the O2 sensor are for the second O2 sensor or the one that is after the catalytic converter. For that reason, it is important to perform an oxygen sensor test before replacing or cleaning the catalytic converter. It determines this by comparing the switching frequency of the front o2 sensor to the back o2 sensor, and if the back o2 sensor is switching approximately less than twice as fast as the front one, it throws the code. Step 3 – Disconnect the wiring harness. Then you will need to get under your Thunderbird and remove the clamps that hold the catalytic converter in place between two lengths of exhaust pipe. Most especially, the year of the vehicle in question. Obviously, both camps can't be correct. I changed the catalytic converter of bank 2, but still showing same codes, is it possible the pre-cat O2 sensor need to be replaced? I'm thinking to switch the pre O2 sensors to see whether the code will go for bank 1. I dont know much about your car specifically but usually bank 1 is the sensor before the catalytic converter and bank two is post catalytic converter. The post-converter O2 sensor is located in the exhaust pipe after the catalytic. Step 4 – Install the new O2 sensor. If you want to get the most out of your vehicle, this PaceSetter product is second to none. Step 3 – Disconnect the wiring harness. I suggest that you take your car and do a few full throttle runs and let it shift at red line. Messing with the front O2 sensor changes the air/fuel ratio. When catalytic converter efficiency degrades to the point that it stops catalyzing exhaust gases properly, the catalyst monitor (rear oxygen sensor) will report it to the computer. Catalytic converter removes about 90% or more of the harmful emssions. disconnecting oxygen sensor after removing catalytic converter, how to unplug the o2 sensor from the cat, if the catalytic converter is removed should the 02 sensor be disconnected also, isidoyu, k20 delete unplug o2 sensors, motorcycle disable o2 engine heat, remove cat and air sensor from motorcycle, removing o2 sensor from exhaust, should i. Loosen and remove the alternator. A catalytic converter is essential to your vehicle's emission system; it functions by transforming "raw" exhaust into less environmentally damaging gases. The car sounded like it had an exhaust leak as well. I would recommend getting it custom tuned by someone using HP tuners, you can turn off that code in the tune and the light will not be on. The oxygen sensor (Lambda or O2 sensor) is connected to a computer that meters and controls the system to maintain as best as possible, this 14. So what is Sensor 1? Sensor 1 is the O2 sensor that is located before or upstream of the catalytic converter. There are two oxygen sensors: one is upstream of the catalytic converter and one downstream of the catalytic converter. It’ll clean everything it comes into contact with, like your catalytic converter, fuel injectors, cylinder heads and more. O2 Simulator Mini Cat, Angled, Straight Cel Fix, Big Daddies Garage stainless steel Oxygen Sensor Simulator is used to clear p0420 / p0430 codes for bad or missing catalytic converters. The tool will strip before it has a chance to get a good pull. Before I'd replace a cat, I'd carefully read the data from the front and rear O2 sensors to be sure I think that the cat's bad. Removal of a working catalytic converter by a shop is a violation of Federal law and can be punishable by a fine of up to $50,000 and possibly jail time. If you want a solution, go get a pair of high flow magnaflow cats installed-it will increase your sound and is supposed to increase performance. The legal criteria for removing a catalytic converter specifies that it must have failed a state or local emissions inspection and have a legitimate need for replacement that can be established and documented. The O2 sensor located downstream of the catalytic converter only has the job of reporting how well the catalytic converter is doing. I did the same to my V10. Need help replacing catalytic converter I need a new (front)catalytic converter after the Pepboys technician did the diagnosis for the code P0420. But this is rare. Bad O2 sensor symptoms include poor gas mileage, rough engine idle, starting trouble, and even failure of the catalytic converter. O2 sensor failure *will not* cause the P0420 to set, but rather will give sensor failure codes. Removing the sensor before removing the heat shield will make it easy to remove the heat shield. PO420 or PO430 CODE CATALYTIC CONVERTER FAILURE DIAGNOSTICS. I noticed that the tech in removing the O2 sensors left the sensor connected and in removing the sensor about 7 or 8 full turns were required to fully get the sensor unthreaded from catalytic converter. One sensor is placed before the catalytic converter, and is called the "upstream" oxygen sensor. Any changes in pressue usually lead to o2 sensor failures which cause serious problems with the fuel/air management. Just reading the details on the link Peter provided sounds very much like the problems that happen when shrapnel from the catalytic converter break off and enter the engine cylinders I wonder what their "fix" is - a replacement convereter or complete removal of it (and replace it with a length of straight-through piping)? ---. Its techically illegel to remove the cats-but unless your state has inspection no one will really know. doityourself. And it will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high. The car has a real hard time going anything above 25 and will begin to choke out if you floor it. O xygen sensor downstream of the catalytic converter in the exhaust system on the back of the engine. it would be louder. In other words, if you remove your cat from your 320, your o2 senors will fault which will trigger MAF problems undoubtly and probaly kill other systems over time. Before I'd replace a cat, I'd carefully read the data from the front and rear O2 sensors to be sure I think that the cat's bad. Simply remove the O2 sensor using your wrench. If you are still willing to take risks for a few notches up in the performance meter, follow the procedure to take the component off from the exhaust system: Unhitch the O2 sensor: The first step is uncoupling the O2 sensor. When you remove the catalytic converter, the rear O2 sensor will see higher temperatures and greater unburned fuel flow. Exhaust pipe head collars. That O2 sensor is useless. I was told many different things by various mechanics as to whether or not it is advisable to remove the failed cat and run it without one. The amount of oxygen in the exhaust varies according to the air/fuel ratio of the fuel injection system. A healthy converter will use a lot of oxygen, and so the rear oxygen sensor will see that there is little oxygen coming out of the back of the converter. I think this is because the converter the dealer put in is the cheapest one available (I didn't know that at the. 9V6 my cat is gutted and it ran better but the check engine light comes on and u have to reset the comuter there is a thing u can get from summit that will replace the o2 sensor but its not necessary : P 1: Post a reply to this message: Username Registration: Optional. The converter is a *very* tight fit, and there is almost no room for mistakes in measurement, cutting or welding. The 2 O2 sensors upstream from the catalytic convertors came out just fine, and the new one went in just fine. It has a 2nd o2 sensor downstream that was orphaned when the spec exhaust was installed. Installing a test pipe should not have any ill affects on the sensor. This can only be done with a specific kind of tool known as an O2 wrench, but you can purchase one from parts dealers for between $30 and $40. My cat substrate was very clean, btw (don't know if it was previously gunked up, because I ran lacquer thinner before removing it). A properly tuned engine with a functioning O2 sensor, will give you a pretty clean exhaust. Just wrap the rear o2 sensors in tinfoil and tie wrap to frame. A bad O2 sensor can destroy your new catalytic converter in just weeks! The bad information it transmits causes the on board computer to adjust either a too rich or too lean fuel mixture, which in turn can create a melt down of the converters substrate or inner ceramic core. I would've ended up replacing it in the future anyways so I might as well do it now and see if the code goes away. If you go further up the manifold you will see the 'hump' that is the actual cat, and in front of that the other O2 sensor. • Pull off the catalytic converter next, separating it from the exhaust system. I Look for the issue causing the high fuel consumption by going for the needed diagnostics test. Remember since it's tricking the system, the sensor still needs to funcutional and working. The converter is a *very* tight fit, and there is almost no room for mistakes in measurement, cutting or welding. Keep the O2 sensor in the same location, however, backspace it with a spark plug non-fouler (drill a larger hole on the thread going into the O2 bung so the O2 sensor can read. Cats dont just fall apart for no reason, something else is wrong in the system for it to fail. I'am planning to buy a o2 simulator. Find the part called a spark plug defouler. This is a more difficult task than replacing the muffler because of the higher heat. I wasted some money on parts I didn’t need. The o2 sensor helps to ensure that the amount of fuel inj. You lost power because you relocated your FRONT O2 sensor. In this How To video, J shows you how to change a catalytic converter. The primary difference between Illinois and any other state is not the specific catalytic converter requirements, but how and where they are enforced. P0420 Causes. Step 1 - Removing the Sensor. The catalytic converter is designed to convert harmful emissions, produced by an internal combustion engine, to less-harmful elements: H2O (Water), CO2 (Carbon Dioxide) and N2 (Nitrogen). I removed and replaced a Rav 4 catalytic converter recently. It will likely take some effort to remove so don't hesitate to use some force. I have noticed a slight increase in performance, Now its christmas and I could do without spending a fortune out for new cats, so I am thinking of either bypassing or removing the insides of the broken one. Weld bung and plugs was easy to weld and offer fantastic value for the user. But this is rare. I would've ended up replacing it in the future anyways so I might as well do it now and see if the code goes away. Pre and post levels are steady at 750 mV, no change under load. The converter is a *very* tight fit, and there is almost no room for mistakes in measurement, cutting or welding. P0430, o2 Sensor or Catalytic Converter?? was created by NissanMaxx Hello everybody. i finally figured out that the o2 sensor is whats causing the. Figured it if didn't work, no harm done as the sensor was throwing codes anyway. P0420 — Is it the catalytic converter or the oxygen sensor? How to diagnose P0420 to determine if the problem is the catalytic converter or the oxygen sensor? I see this question all the time on auto forums. There's no downstream O2 sensor, so it's all good. The amount of oxygen in the exhaust varies according to the air/fuel ratio of the fuel injection system. Since removing a catalytic converter lessens the burden on a car's engine by enabling engine exhaust to vacate the engine more easily, a net effect is a reduction in engine operating temperature. I’ll leave the primary O2 sensor in as it’s not worth my time to pull it out. Removing the catalytic converter will save alot more money than replacing it and will make your engine exhale better and last longer due to the removal of a suffocation device "cat" only issue outta all the ones I've removed it is if the downstream O2 sensor is plugged directly in it, which there are ways around. It is not a "bad sensor" bypass. How To Detach The Catalytic Converter. Now if you delete the cat the ecm will know the values on the o2's will be the same and a cel (check engine light) will come on sooner or later with todays high refresh rate sensors. The cat will do the final cleaning of the emissions. This is the more difficult way of dealing with any Catalytic Converter problems. I noticed that the tech in removing the O2 sensors left the sensor connected and in removing the sensor about 7 or 8 full turns were required to fully get the sensor unthreaded from catalytic converter. Over time deposits form on you Catalytic converter and oxygen sensor rendering your vehicle's performance lower than it should be. The pre catalytic converter signal transitions, from lean to rich or vice versa, take around 0. The post catalytic converter sensor signal Channel B remains around 0. Most newer vehicles have more than one (and as many as four), with the second sensor farther down the exhaust pipe, closer to the catalytic converter. Catalytic Converter removal and HP gain 01-31-2010 09:35 PM #1 Got a magnaflow turbo back on my car with an apr test pipe file but never got around to removing the cat. This O2 cel fix actually has a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a high flow catalytic converter. If the code indicates a bad cat…then further tests need to be run to determine if it's a bad O2 sensor or a bad cat. Well I've heard that a clogged cat can also cause the same code to pop up. Shop safely with us online or call 888-844-3393 and buy the quality part your car or truck needs today. Disconnect the o2 sensor from the top as well but leave. It cannot be removed permanently from the vehicle. The downstream O2 sensor in or behind the catalytic converter reacts to the exhaust gases as they exit the converter. Even if you replace with suitable catalyst don't expect such a significant fuel improvement. Buy Universal Fit 2" Inlet/Outlet 13" Overall Length Catalytic Converter with O2 Sensor Port High Flow Converter Cats EPA Approved (ATCC0016) at Walmart. Is there an O2 sensor at the exit of that converter. The rear O2 sensor is just to determine if the cat needs to be replaced. Catalytic Converter and Oxygen Sensor Cleaner. How to keep the check engine off when removing catalytic converter Redneck Engineering Do O2 sensor spacers work to help pass How To Fix A Catalytic Converter Check Engine Code With Spark. There are a few O2 sensor codes, ranging numerically from P0030 to P0064 and P0130 to P0167. Installing your post cat O2 sensor without a Catalytic converter installed will make your Malfunction Indicator Lamp come on. If its B2 S2 that means Bank 2 (opposite Bank to Bank 1) and the downstream after cat o2 sensor. The cat will do the final cleaning of the emissions. Replace your catalytic converter with a stainless steel straight pipe and watch your MPGs soar. Hello! I recently took my car to meineke and had them replace my oxygen sensor before the catalytic converter. • Pull off the catalytic converter next, separating it from the exhaust system. The dealership confirmed it's the catalytic converter (front and rear apparently ) My 2000 SR5 has about 147,000 miles on it and I believe at least one O2 sensor was replaced prior to me buying it a month ago. It sucks, but you're going to need a few tools and some know-how to get it out so you can be back on your way. The sensor located after the catalytic converter is used to measure the performance of the converter by comparing the O2 levels before and after. $60 on a bank 2 primary O2 sensor, $175 non OEM catalytic converter, and another $60 on a secondary O2 sensor. I was told many different things by various mechanics as to whether or not it is advisable to remove the failed cat and run it without one. Now if you delete the cat the ecm will know the values on the o2's will be the same and a cel (check engine light) will come on sooner or later with todays high refresh rate sensors. On the exhaust side, these are oxygen (O2) sensors, which detect how much oxygen is in the exhaust, and tell the computer how lean or rich the. The converter was bad with a P0420 code. Installing a test pipe should not have any ill affects on the sensor. Its role is to inform the ECU of the oxygen content of the burned gases that result from combustion. hi to everyone,i'm proud owner of 97' Infinity QX4 i looked under the car and there's no rear oxygen sensor so i'm wondering if i remove both of the catalytic converter (since i don need to pass emission in my counrty) would i have any problems with the ECU and probably CEL on. i finally figured out that the o2 sensor is whats causing the. If I was going to replace a sensor prior to a solid DTC being logged, it would be the air/fuel ratio sensor located upstream of the catalytic converter. Had to replace the catalytic converter when the check engine light came on for the first time back in 11/04 when the vehicle had 139k miles. i finally figured out that the o2 sensor is whats causing the. Reports where it worsens running conditions are likely if the sensor is bad or old. I can tell by my exhaust smell that my Catalytic converter is not working, but it doesn't smell rich. This O2 cel fix with miniature cat will trick your ECU into thinking the stock catalytic converter is still installed. Step 2 - Removing the Converter. The oxygen sensor plugs was made of plated mild steel with zinc plating. Removing Catalytic Converter. Zirconia sensor. Theres usually a oxygen sensor around or even inside the cat so when you remove the cat it causes codes to be sent to your computer and your check engine light will come on. The DVOM can be used to check voltage and ground signals for the O2 sensor circuit, as well as resistance of the O2 sensor in question. The guy who installed my headers left out the front O2 and I thought he was talking about the back ones like I had instructed him too. They probably see this all the time. Step 3 – Remove the exhaust catalytic converter. Zirconia sensor. How to replace the rear oxygen sensor P0136. You may need a new catalytic converter. To the original question: The only way the ECU knows a cat is bad by the readings it get from the O2 sensors. Well with my understand the catalytic converter put back pressure on the motor which in turns reduces the horsepower and fuel mileage, because of extra amount of work the engines needs to recycle the already burned gas. 2L Universal Catalytic Converter Recommendation; Will Universal Catalytic Converter Fit a Kia Rio if the O2 Port is in a Different Place; Universal Stainless Catalytic Converter With 2. The rear O2 sensor is just to determine if the cat needs to be replaced. 2 out of 5 stars 15. Well my truck ran rich as heck and sounded like a cam. You can do with a special tool called an O2 wrench. Removal of a working catalytic converter by a shop is a violation of Federal law and can be punishable by a fine of up to $50,000 and possibly jail time. So a resistor can replace the o2 sensor to bypass the cat converter. Do you occasionally get code P0420 - catalytic converter low efficiency? This $3 electrical circuit may fix the problem permanently by electrically smoothing out the o2 sensor output. Some of the processes seen here are specific to this exact vehicle application. I bought an O2 sensor removal socket that works perfect for the driver side, but how do you get to the passenger side one?. The ECM calculates the catalytic converter's efficiency by making a ratio of the front O2 sensor over the rear sensor. It might work. Just screws in no complicated wiring, this o2 simulator spaces the oxygen sensor precisely the exact distance out of the exhaust flow for a precise reading by your oxygen sensor, easy to install. Do I need to get a tuned PCM that disables the after-cat O2 sensor? Otherwise, I suppose my best bet is going to be replacing it, but if I can remove it and not have an SES light on or shitty performance, by all means, I am going to do that instead. My catalytic converters are rattling up a storm. Sensor 1 is the O2 sensor that is located before (upstream) of the catalytic converter or also called the pre-catalytic converter. The reason for this being that with use, they break down and actually end up doing more harm then if they were not there at all. If the code indicates a bad cat…then further tests need to be run to determine if it’s a bad O2 sensor or a bad cat. I noticed that the tech in removing the O2 sensors left the sensor connected and in removing the sensor about 7 or 8 full turns were required to fully get the sensor unthreaded from catalytic converter. RE: fake out O2 sensor IP: Logged Message: call summit racing 1800230 3030 they can get you a o2 plug loop to fake your comp. This is the more difficult way of dealing with any Catalytic Converter problems. It has a 2nd o2 sensor downstream that was orphaned when the spec exhaust was installed. LUOTIVON O2 cel fix actually has a miniature catalytic converter built inside which will trick your ECU into thinking the stock catalytic converter is still installed. Not only would removing the cat be illegal but if the exhaust system has an O2 sensor(s) the Jeep could end up with deteriorated. I was also under the impression that without that sensor, the ECU is unable to operate, essentially breaking. Removing a Cat on a OBDII/III vehicle is just plain stupid, you gain NOTHING, and most times you lose HP, MPG, not to mention its illegal. Clogging in the catalytic converter can also prevent you from cleaning it without removal of the converter itself.