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



lenova, Sidney, KY, June 27, 2014, 11:47

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.

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  • Answer #1

    June 28, 2014, 00:55

    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.

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    lenova, June 28, 2014, 09:13

    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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