Question about 2003 Chevrolet Impala
This code is for catylist efficientcy below normal. Change the catalytic convertor. Good luck!
Posted on Oct 20, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
Jun 30, 2012 | 2003 Chevrolet Impala
Feb 16, 2012 | 2002 Chevrolet Impala
Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
Inspect the downstream heated oxygen sensor (HO2), replace if necessary
Replace the catalytic converter
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