2001 Buick LeSabre P0420 error code

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signots

Post subject: 2001 Buick LeSabre P0420 error code

Posted: Wed Aug 15, 2012 11:53 am

Joined: Wed Aug 15, 2012 11:49 am
Posts: 1

Check engine light came on. A friend read the code and reset. A month goes by and the CEL is on again. Car runs the same now as always. What is the fix(es) for a P0420 code on the above vehicle? Steve

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Post subject: 2001 Buick LeSabre P0420 error code

Posted: Today

Joined: 29 Jun 2004 08:12 pm
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kev2

Post subject: Re: 2001 Buick LeSabre P0420 error code

Posted: Wed Aug 15, 2012 2:04 pm

Joined: Sat Aug 29, 2009 4:24 pm
Posts: 804

No other issues?
1) need to work this by observing the 'o2 sensor' readings, esp shifting of the post cat sensor.

2) checking cat effeciency a possiable failed cat.

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