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CEL with PO420 code
I have a 1999 California emissions Maxima with 105000 miles. In July the CEL went on with a PO420 code indicated. My Nissan dealer wants to sell me a new catalytic convertor, but I am hoping it is something less costly. I have always used regular gas with no apparent problems. Could this be the culprit and besides changing to high test (which I have done) what else can I do? Thanks in advance. Ross
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