My first Check Engine Light
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Veteran
Joined: May 2009
Posts: 332
Likes: 0
From: King Of Prussia, PA
My first Check Engine Light
I guess my brand new truck is no more. After 83,000 miles I saw my first CEL last night. It throws the P0421 code. Reading up on these codes is useless. There are half a dozen culprits. Is there one primary suspect?
All Star
Joined: Aug 2011
Posts: 759
Likes: 18
From: Ottawa, Ontario Canada
P0421 Warm Up Catalyst Eff Below Threshold Bank1 is what I read. I think most will suggest that you disconnect the battery overnight to clear the codes and try again. Could be one of those darned things.