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Trouble code po420 in my 2000 sierra - 2000 GMC Sierra

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The O2 sensor after the Catalytic converter has gone bad or the converter it self. Lets start with the simple and replace the cheaper of the two but before you do that, check the wire harness where the O2 sensor clips on to the wire harness at the frame. Look for any damage to the clip such as corrosion or broken wire. Good luck and hope this helps.

Posted on Jul 03, 2009

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Posted on Jan 02, 2017

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What is the C0265 error code


The ABS EBCM anti-lock brake module is failing causing problems with the ABS pump running constantly, also will drain your battery.
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1 Answer

How can i read the code on my 97 gmc sierra truck


To access trouble codes you'll need a code reader or scanner.

Sep 07, 2014 | 2002 GMC Sierra C/K1500

1 Answer

1998 gmc Sierra Engine light comes on and says O2 sensors. Replaced all sensors. Next day the light comes back on and says O2 sensors. What causes them to blow?


Hi, there are a number of trouble codes associated with the O2 sensors. Some indicate a sensor failure and others indicate a different problem. Can you tell me the trouble code you are getting?

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Nov 11, 2009 | 1998 GMC Sierra

1 Answer

Trouble shooting


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1 Answer

Trouble code P0236


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Dec 11, 2008 | 1997 GMC Sierra

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