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I did not pass smog
2004 SATURN L300
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
This is a cat converter code. You must replace the converter not the sensors.
Saturday, December 29th, 2012 AT 4:01 PM
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