I DID NOT PASS SMOG

  • Tiny
  • Anonymous
  • 2004 Saturn L300
  • 225,000 miles

I did not pass smog. May you please advise what is code p421. I changed one sensor which (bank 1) but engine lite is still on. How many sensors in this model. My engine size is 6v. Bngine.

Saturday, December 29th, 2012 AT 4:00 PM

1 Answer

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,549 posts

This is a cat converter code. You must replace the converter not the sensors.

Roy

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Saturday, December 29th, 2012 AT 4:01 PM

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