This is a discussion on P0420 code within the External Engine forums, part of the LSx Technical Help Section category; SES light popped up the beginning of August. P0420, Bank 1. I cleaned my MAF and replaced my K&N with ...
09-18-2010, 02:06 PM #1
SES light popped up the beginning of August. P0420, Bank 1.
I cleaned my MAF and replaced my K&N with a WIX paper filter.
I figured I'd just have to suck it up and replace the cat. I missed the extended warranty by 6 months
The SES light stayed on for about 20 more miles or so after I did the MAF and filter change. But, now it's gone. And, it's been gone for a few weeks now.
09-18-2010, 05:24 PM #2
Took a few drive cycle's for the computer to find its happy place. Your maf was probly covered in oil from the K&N filter.
J2001 SS, Its not the car its the Driver that matters....
09-18-2010, 05:30 PM #3
But, then I read that it wouldn't 'fix' the problem and that the only cause for the P0420 code is the converters and that they would have to be replaced.
So, am I good to go then? No need to worry about the cats?
09-18-2010, 05:37 PM #4
Only time will tell but i can tell you from experiance K&N filters are garbage and cause tons of problems without any gains or justifible protection. I have seen the code along with a few others because of a dirty maf. Normaly when your cat starts to plug up you get a foul odor and loss of power with the codes, even a rough idle.
09-18-2010, 05:43 PM #5
Well, I'll just keep my fingers crossed then and stick with the paper filters.
09-20-2010, 02:42 PM #6
Anytime, Let me know if ya need some cats, i think i have a set in the shed with a few thousand miles on them.
09-20-2010, 03:07 PM #7
Just ditch the cats lady!!!
Oh wait...you live in Cali
09-20-2010, 03:08 PM #8
09-20-2010, 03:08 PM #9
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