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 : 18-11-2019

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

Tips for a great answer:

- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.

Suggested Questions/Answers :

Loading ...

  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
  • Use proper spelling and grammar
all rights reserved to the respective owners || carrestorationshop.com || Terms of Use || Contact || Privacy Policy
Load time: 0.0054 seconds