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

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.

by in Sidney, KY on June 27, 2014
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1 answer 1 comment
ANSWER by , June 27, 2014
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 by , June 28, 2014
Thank you for your response,I will have the rear 02 sensor and cat.convertor serviced. Again Thank you and have a Blessed Day.