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Re: 2003 chevy impala trouble code 0420
how many miles on car? it could be the cat, could also be the o2 sensor after the cat is going bad. a good scan tool is needed to read the actual values of the sensors.
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Disclaimer: I am not perfect, i may be wrong in my advice from time to time. Also note that any advice given is as is with no warranty whatsoever, and i have zero liability if you get hurt for not being safe while working on your vehicle.
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