Having problems with your 2003 Chevrolet Impala ?

Says that my catalyst system efficiency is below threshold bank 1-code p0420 catalyst convertor is new and check engine ligh back on ,2003 impala,what do i do now ,i have replaced sensors and car is running hot

Posted / edited by AnonymousUser on : 03-08-2020

Answers :

Afraid you will need a mechanic for this one.
If the engine is running hot you could have a restriction in the exhaust.
We can check exhaust flow with a Infared thermometer.
Repair Help & Product Troubleshooting for 2003 Chevrolet Impala

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