Re: Help: P0420 code
Can you post the sensor values for the oxygen sensors?'
Fuel trim for 3 and 4 look WAY off. It's saying that 3 and 4 are running EXTREMELY rich.
You have three main causes for the code, the H02S, the catalytic converter, or a leak in the exhaust. Judging by your fuel trim, it's most likely in the sensor.
Has any other work been done on the vehicle?
It might be time to get a real diagnosis done on it though, one way or the other something is not right and it could end up being very bad. If it's leaning out the engine that much, it could damage it.
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2004 Marlin Blue Pearl Sequoia SR5 2WD; 60k miles
1991 Isuzu Trooper 2.6L 5spd 4x4; 103k miles
1993 BMW 525i M50TUB25 auto; 286,500 miles
ASE Certified Brakes Technician / Automotive Electrical Specialist
Independent BMW Technician
Last edited by JBH1989; 12-26-2008 at 02:06 AM.
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