Question about 2001 Chevrolet Impala

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What does error code p0420 in chevy impala 2001 mean ? how we can fix it?

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  • Jeremy W.
    Jeremy W. Sep 28, 2010

    Its a code for Catalytic converter inefficiency. A new catalytic converter will usually take care of this. Be careful if you decide to go with an aftermarket cat. Some do not work as well as the O.E. cats and will continue to give you troubles.



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  • Chevrolet Master
  • 5,332 Answers

I meant to post that as a solution.

Posted on Sep 28, 2010


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SOURCE: 2002 chevy impala p0420 code.

Probably a failed catalytic converter. More info at

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

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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...

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