| Re: 2000 Catera Check engine code "P0411" This can be soo many different things that this could be. For me, I would clear the code and it would be off for a day or two. I never had anything else be affected by it, so i let it go. When I had my cooling system redone, they found a tiny hose that cost me $0.98 that had a pinhole in it. A pinhole. That's it.
I'm not saying this is something that you have, but it could be. I also looked into it being a defunct gas cap. For me my Check Engine light was on for about a year before I happened to get it fixed.
Matt |