Having problems with your 2000 Cadillac DeVille ?

What does code po420 - 2000 Cadillac DeVille

Posted / edited by AnonymousUser on : 24-01-2022

Answers :

\012P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1)\\
This means that your bank 1 catalytic converter is not doing its job, or the O2 sensor system monitoring it has an issue.
Repair Help & Product Troubleshooting for 2000 Cadillac DeVille

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