Question about 2002 Buick Rendezvous

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I have 2002 avalanche and my engine light came on

I have 2002 avalanche and my engine light came on so i pulled the code and it said 0420 which means o2 senser or what else could this be

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There are a number of things that could be causing this p0420 catalyst efficiency code. The most common thing is the catalytic converter itself is no longer functioning properly. The other likely thing is the rear O2 (oxygen) sensor is no longer working properly. Other things could include exhaust leaks, damaged exhaust pipes, damaged O2 sensor wiring/connectors, plugged catalytic converter, etc.

The easiest thing to do first is a visual check of things. Visually inspect the exhaust system for leaks, check the catalytic converter for dents, holes, severe discoloration, and check for a rattle inside. If any of those symptoms are there, the converter likely needs replacement. Then, visually inspect the downstream O2 sensor (behind the converter). Check for broken wires, obvious faults, etc. If all that checks out, you'll want to check the operation of the O2 sensor. To do that, you'll need access to a scan tool or oscilloscope. Check that the waveform is pretty steady. If the reading fluctuates then the sensor is likely bad and will need to be replaced.

Good luck and hope this helps.

Posted on Nov 19, 2009

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This typically means the catalytic converter is not performing within the specified range. Often though, the O2 sensor itself is failing. You will need a scanner that reads the O2 sensors to determine whether the sensor is at fault. If you have one, let me know so I can further assist you.

Posted on Nov 19, 2009

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I have attached a link that can give you some of the reasons why your getting that code.I hope you able to get your answer out of that.
Mean of the code=P0420 Catalyst System Efficiency Below Threshold.
Link to site

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