Hey Everyone,
My check engine light has been on for quite some time now, ever since I purchased my car about 4 months ago. The previous owner told me it wasn't a big deal, and that once I figured out what the problem was, he'd help me fix it. I recently got my emmissions tested and their diagnostic machine told me the CEL code was: P0420. It describes this as "Catalyst System Effieciency Below Threshold (Bank 1)." Does anyone know what this means exactly and how I would go about fixing it?
Thanks,
Barrett
Edit: I actually used the search function on the site and found a lot of listings for P0420. Sorry for the useless post.
Last edited by Barrett54; 02/28/05 11:09 PM.
