IMissMyLexus Posted June 7, 2011 Share Posted June 7, 2011 I got a Lexus IS300 and the light wasn't on. After I changed my original exhaust to another exhaust (its factory from another Lexus IS300, not after market), then sometime after that, the light is on so I don't really think its the O2 sensor. I took it to autozone and the guy plugged the computer into my car and found 3 possibilities, one of them is catalytic converter. So I was think that is the catalytic converter malfunction or that the guy didn't properly install the exhaust. Does anyone know anything or have similar experience? Please help or recommend. Thanks Quote Link to comment Share on other sites More sharing options...
IanH Posted June 7, 2011 Share Posted June 7, 2011 Post the codes. how many miles on the CAT's ? Exhaust Manifold and rear CAT..... Yes had 0420 code on mine. Quote Link to comment Share on other sites More sharing options...
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