2002 CHEVY IMPALA ABS, TRACTION CONTROL & CHECK ENGINE LIGHT

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Rinda
Posts: 10
Joined: Tue Feb 25, 2014 4:30 pm

Re: 2002 CHEVY IMPALA ABS, TRACTION CONTROL & CHECK ENGINE L

Unread post by Rinda »

Sorry, haven't had time to work on car lately, so haven't checked oxygen sensors as of yet. But a little more info on the P0420 code, before we do. Code reader states P0420 catalyst system efficiency below threshold bank 1. Does this still mean the catalytic converter or oxygen sensors? Wasn't getting the bank 1 on previous readings.

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carriedi
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Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 2002 CHEVY IMPALA ABS, TRACTION CONTROL & CHECK ENGINE L

Unread post by carriedi »

the bank one just tells you which side converter is working poorly. Some cars will say bank one but only have one cat. Bank one cat. is to tell which side when you have a converter for each side of the engine. bank one or bank two
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