2004 Saturn L300 Did Pass Smog May You Advise Code P421 Changed One

2004 SATURN L300
225,000 MILES
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ANONYMOUS
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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.
Dec 29, 2012 at 4:00 PM
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ASEMASTER6371
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this is a cat converter code. you must replace the converter not the sensors.

Roy
Dec 29, 2012 at 4:01 PM
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