karrkrazzie Posted June 1, 2009 Report Share Posted June 1, 2009 So my car is shooting me a cods number PO420 ... catalyst efficiency on bank 1 ... I have absolutely no idea what the problem is, it actually had the code in there twice, and I cleared it, took it for a ride, and it didnt come back on. My gas mileage went down, and i had lack of power at times. The only connection I can make is the cyl. number 1 fuel injecter was ticking very loudly. If you have any ideas let me know, or if you need any more information, or I confused you with anything, let me know. Thanks a lot guys. Quote Link to comment Share on other sites More sharing options...
slick Posted June 1, 2009 Report Share Posted June 1, 2009 Catalytic convertor. They typically fail due to a faulty O2 sensor. When was the last time you gave your car a tune-up? It certainly will help, but you still will probably throw the code. I'd check out the catalytic convertor. Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 1, 2009 Report Share Posted June 1, 2009 ya the cat is probably done. Depending on your vehicle's mileage, you may have a problem that caused it to fail (usually it's a fuel related problem causing excess raw fuel to enter the exhaust stream and overheat the cat) Quote Link to comment Share on other sites More sharing options...
karrkrazzie Posted June 1, 2009 Author Report Share Posted June 1, 2009 makes sense, that is sort of what I was thinking just because the spark plug wires were arcing and obviously causing a misfire.... my only question how does the car know it is on bank one??? Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 1, 2009 Report Share Posted June 1, 2009 It doesn't. Our cars only have one upstream O2 sensor, but OBD2 language requires it list which "bank" it is. Some other cars have an upstream O2 sensor for each side of the engine (those cars will have Bank 1 and Bank 2) but we don't, so our single O2 is listed as Bank-1. Quote Link to comment Share on other sites More sharing options...
Brian P Posted June 1, 2009 Report Share Posted June 1, 2009 Oh and yeah, depending on how long the misfire was occurring, and how old the cat is, the excess unburnt fuel passing thru the cat as a result of the misfire could have killed it. There's a chance the cat may clear up after some long driving, but if the code continues to come up, you'll need to replace it. Quote Link to comment Share on other sites More sharing options...
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