Question about 2003 Chevrolet TrailBlazer
Is the vehicle running? If so, what is the driveability concern that prompted a code check? How many miles are on your vehicle? Were there any repairs done recently, and if so what? I apologize for all the questions, but this will help us with a starting point. Thanks in advance.
Posted on Jul 15, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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hi,my friend, you can try,
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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