Mechanics

SATURN L300 SENSOR PROBLEM

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.
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Guest
December 29, 2012.



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

Roy

ASEMaster6371
Dec 29, 2012.


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