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Re: 03 impala catalytic converter
Quote:
Originally Posted by capitalJoe
and the computer will reset the rpm's and gear ratio on its own.
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Please explain that? 
Quote:
Originally Posted by gordon_gjs
I replaced the cat in my car with an aftermarket after it was plugged and it throws the code p0420. I have a 2003 impala 3.8l impala. I am not sure what brand it was, it was a muffler shop that installed it.
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Running rich (what probably plugged the first converter) can damage O2 sensors. May need to replace them, or a bad O2 sensor may have been misdiagnosed as a bad cat.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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