i keep getting a p0430 error code on my chevy tahoe. i know what this code is supposed to mean is wrong but i have replaced the cat, o2 sensors, and checked for exhaust leaks. the vehicle is not very powerful anymore, especially at cold start. if i take the vehicle to get an emissions test(even though it’s not due to), would they be better at diagnosing the problem or will they just tell me i can’t drive until i fix the issue?
did you take a look at the freeze frame date to see what the cpu was doing to rectify the problem. you can look at fuel trim to see which direction it chose to go. id bet that you are running very rich doe to an internal fuel leak for some reason.
November 14th, 2009 at 3:27 pm
Take it to a reputable diagnostic service center. For around ninety bucks it will pinpoint your problem. Otherwise, it will land up nickle and dime you to death.
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November 14th, 2009 at 3:50 pm
The emissions people will just give you a list of possible causes. Aside from bad O2 sensors, this code is caused by a bad air/fuel mixture that has destroyed the cat converter. That can be caused by a bad fuel pressure regulator, a leaking fuel injector, bad spark plug, wires, etc.
Here’s what you should do. Insist that your mechanic call a tech support line. His parts supplier will put him in contact with their tech support line (all the big auto parts stores have them). It will cost you about $50 for him to make that call. But at least he’ll be talking to experts who deal with this stuff all day long. They’ll walk him through all the tests he needs to do until he finds the solution.
It will be the best $50 you ever spent.
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November 14th, 2009 at 4:37 pm
did you take a look at the freeze frame date to see what the cpu was doing to rectify the problem. you can look at fuel trim to see which direction it chose to go. id bet that you are running very rich doe to an internal fuel leak for some reason.
References :