In the afternoon I got in it and the idling issue was back and car had same issue where I could barely get any power and car is bucking, check engine light flashing again. According to the internet, it might be the catalytic converter or the o2 sensor itself For those who have Cp-e catted downpipe, what would you suggest? Don't replace all of it if you don't have too. You would need a scanner to watch the readings coming from the O2 sensors and the engine temp among other things to be able to determine the cause or causes. These are listed in numerical order for easy searching. As I pulled in it stalled on it's own. Code 431 is the same thing for bank two. The catless version has a pretty long extension on it already, which is probably why I've been so lucky.
Tech notes As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly is not as efficient as the factory is expecting. Some aftermarket catalytic converter manufacturers make cheap parts and can fail prematurely. In order for an engine to run well, it must be able to breathe properly. The P0421 code can be very serious. A visual inspection is always the best place to start with any automotive diagnosis. The list of automotive Makes at the right edge of the screen.
I am a little skeptical of the shops' suggestion to replace the catalytic converters because the car runs fine except for the check engine light bein on. If your car is setup like mine and I think it is , there are two Cat's. In warmer weather the car was fine, but in zero to 40 deg. I've even wondered if it's a computer issue. This code gets thrown if the reading from the first O2 and the second O2 don't jive. It was the Cat the whole time.
If it dips below 40 degrees, I basically just have to let it idle for longer than 45 seconds and then I'm fine. Look up the other , please use the search box. Please use the form on our Contact Page to get in touch with us. If the P0421 code is combined with other codes, try fixing the other codes first. I believe its either a bad catalytic converter or a bad downstream Oxygen Sensor.
We certainly understand how frustrating it can be to look for a code definition and have it not online when you need it. It took it about a month ago for a check engine light and the dealer flashed it with the latest firmware saying it was the code p0401. Hopefully they'll change the valve this time. Also my mileage has remained the same. The check engine light came on after two weeks so I decided to buy a scanner and to my surprise it's the same code the dealer detected before. Then don't expect your new cat to last very long.
How serious is the P0421 code? There are approximately 64 high resolution pulses for every cam pulse. Are there any aftermarket options that are cheaper? I have replaced the 2nd coil since my last post. In the afternoon I got in it and the idling issue was back and car had same issue where I could barely get any power and car is bucking, check engine light flashing again. I've even wondered if it's a computer issue. If you find one missing let us know and we we'll add it immediately! If the catalytic converter has failed and the engine is not running properly, severe engine damage can result from continuing to drive the vehicle. P0421 is probably the Cat, I had to replace mine too, but it shouldn't cause the engine to misfire. Replacing the oxygen O2 sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem.
Replacing the oxygen O2 sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. So please read our and when you're ready jump in! The currently selected is for the Mazda makes. They will provide valuable info! I get the impression it is the cat. If the two readings are identical, or very close to each other in value, the Check Engine Light will be illuminated and a P0421 code will be stored. I am a little skeptical of the shops' suggestion to replace the catalytic converters because the car runs fine except for the check engine light bein on. Mechanic said my fuel pump was bad and a miss fire code was present so had fuel pump it replaced.
Hope this helps : Note, I am not a mechanic, but i have the shop manual and I have experienced this issue and did the work myself to fix it. Common mistakes when diagnosing the P0421 code A common mistake that a mechanic could make when diagnosing a P0421 code would be skipping over the full diagnostic and just replacing the catalytic converter. Although this is the most likely cause of a P0421 code, it is not the only cause, and every other possibility should be ruled out before replacing any parts. I will be watching this thread. A three way catalyst converter Manifold with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2.
There are approximately 64 high resolution pulses for every cam pulse. The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there? Circuit P1687 Metering Oil Pump Stepping Motor Cont. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days. From other research I did on this board and others, the problem occurs like this: engine starts to misfire for some reason. Jan 04, 2013 Converter is not working as efficiently in Bank 1 and Bank 2 two codes. As I started driving it barely had any power I have a stick so I drove it to a big parking lot where I knew I'd have it towed.
According to the internet, it might be the catalytic converter or the o2 sensor itself For those who have Cp-e catted downpipe, what would you suggest? I changed the O2 sensors prior to the Pre-cat hoping to save some money but to no avail. If this issue is happening only during the warm up period that the vehicle is running, then a P0421 code would be stored. I've even wondered if it's a computer issue. Good luck and I hoped this helped you. We are not responsible for any actions you take on your vehicle.