Join Date: Jan 2006
99BlazerLS2WD is offline
Error Code P0420
I know there are several threads on this, but this is a little weird...
I had a new Magnaflow Catalytic converter installed about 2 months ago (the old one was rattling like a tin can). Everything was running fine until about a couple of weeks ago when my car started throwing the P0420 code *Catalyst efficiency low bank 1*. I figured that since I had a new Cat. Converter, that it was more than likely my O2 sensor going bad (after the Cat). I installed the new one this past weekend, but the CEL is still on. Right now I'm wondering what the heck to do. My Blazer runs fine... I just have this annoying light on. Any ideas???