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2002 chevy impala p0420 code. Not really sure what this means or how to fix the problem

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  • Anonymous Mar 27, 2009

    03 chevy impala p0420 code

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Here is a site that may help you with your po420 code http://www.aa1car.com/library/p0420_dtc.htm

Posted on Mar 04, 2009

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Probably a failed catalytic converter. More info at http://p0420.com

Posted on Apr 15, 2009

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I have 2002 chevy impala changed the 02 sensor and it is still reading the same 02 sensor.


because its not the sensor.
its the plug for the sensor .the wires.or it
is the cataletic converter/exhaust system
i just replaced my exhaust on my 07 chevy malibu same o2 sensor issue p0420 or something like that ?!
replace the converter and youll be fine i still have my old sensors in there that gave me the code :)
there not saying there bad but that the cat is bad.

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Went to autozone got code p0420 what do i check 2002 chevy avalanche


That's an oxygen sensor/converter issue. When the (2) O2 sensors read exactly the same readings (one either side of converter) means converter is bad.

Mar 06, 2011 | 2002 Chevrolet Avalanche

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Radiator fans fuses keep blowing-chevy impala 2002. we need info on following codes: P0108, P0128, P 0341, P 0401, P 0420, P 1480, and P 1481. John


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1 Answer

My catalytic converter is operating below factory recomendations, what needs to be fixed?


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Mar 16, 2010 | 2002 Chevrolet Impala

1 Answer

2001 chevy impala has a P0420 code and a check engine light that will not reset. Earlier P-codes indicated a problem with cylinders 1-3. these codes reset after a while. Found intake vacuum house off on...


A code P0420 may mean that one or more of the following has happened:

An oxygen sensor is not reading (functioning) properly
The engine coolant temperature sensor is not working properly
Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
Retarded spark timing

Apr 04, 2009 | 2001 Chevrolet Impala

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