Question about 2002 Chevrolet Impala
Could be intake gaskts leaking causing this or could be bad cat. convertor on bank 1 cylinder head, could be as simple as a bad spark plug causing that bank to run nonefficient. Bank 1 is the cylinder head that is the closest to you when standing on r side of car looking at engine (passenger side) you will see one head which is closer to you than the other...that is Bank 1
Posted on Feb 16, 2012
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Posted on Jan 02, 2017
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Mar 18, 2015 | 2002 Chevrolet Impala
Some suggested steps for troubleshooting a P0420 error code include:
Overall probably the biggest mistake vehicles owners make when they have a P0420 code is to simply replace an oxygen sensor (H02S). It is important to do proper diagnosis so you're not wasting money replacing parts unnecessarily.
We strongly recommend that if you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part. There are many stories in our forums where folks replaced the cat with a cheaper aftermarket one only to have the code return shortly thereafter.
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.
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Jun 22, 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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