code P0420

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My car was half full with regular unleaded gas on Wednesday. I filled it up on Friday with premium unlead gas. On Saturday my check engine light came on. I took it to Autozone and the code was P0420. Could having both regular and premium gas together cause this problem?

Mightyone in Dewey OK

Mar 10, 2011

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RepairPal Certified shops can diagnose and repair your 2009 Nissan Sentra. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

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code P0420

What is your question?

Mightyone in Dewey OK

Mar 10, 2011

1 Reply

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DaveJMon Mar 11, 2011

The gas mixture is just a coincidence. However, you really should have a warranty still on a 2009 Sentra, unless you have over 80,000 miles. The P0420 refers to a catalyst efficiency issue. This could be for several reasons, but should have a professional diagnosis performed.

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Popular Answer

What are the best Nissan repair shops?

RepairPal Certified shops can diagnose and repair your 2009 Nissan Sentra. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.