BECOME A MEMBER
Sign up with Facebook
I agree to the
Login with Facebook
NOT A MEMBER?
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
to post a reply.
Related Smog Fail Content
Oil Blowing. Out The Air Filter Case
Fail Your Smog Test? Fix it Fast
Instructual repair video
2003 Saturn L300 Emissions
2003 Saturn L300 6 Cyl My Saturn L300 Failed The Emissions Test. We Put The Scanner On It And The Bank 1 & 2 Sensors Were Reading...
Ask a Car Question. It's Free!
Code Read Retrieval/Clear Mercedes Benz
Check Engine Light Clear
Step by Step video GMC Yukon XL 2000-2006
Find a car manual for your car
© 1999 - 2017 2CarPros, Inc.