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2009 Nissan Sentra

Question: code P0420

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Mightyone, 2.0L 4 Cylinder, Dewey, OK, March 10, 2011, 15:26

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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?

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• Answer #1

  DaveJHM March 11, 2011, 05:53
  

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  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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