1997 Buick Century Q&A

1997 Buick Century Question: My Service Engine Soon will come on.

When I check the system with a scanner at my local mechanic the code that appears is PO420. This car has a 3.1 v6 with automatic transmission. If anyone has encountered the same problem please e-mail any suggestions to correct the problem. Thank you and may you have a Blessed Day. -
Answer 1
P0420-catalyst below efficiency , have system (rear O2 sensor) monitored with scanner(NOT CODE READER!!!!!) to verify converter function. Clear code and see if it returns. -
Comment 1
Thank you for your response,I will have the rear 02 sensor and cat.convertor serviced. Again Thank you and have a Blessed Day. -
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