My Mazda Millenia 2000, check engine light came on, i checked at the nearest advanced Auto shop and got the following code: P0420 , Catalyst System Efficiency below Threshold bank 1. Can someone help

My Mazda Millenia 2000, check engine light came on, i checked at the nearest advanced Auto shop and got the following code: P0420 , Catalyst System Efficiency below Threshold bank 1. Can someone help 1 Answer

Emission code P0420, Can someone please explain code to me? 16 Answers

My check engine light came on with a P0420 code, which means,catalyst system below threshold Bank 1. Can someone tell me what that means in terms of what the problem is? Thanks, Tony

I recently change my O2 sensor on my 2000 chevy silverado. after replacing bank 1 and 2, I reset the it with the code reader. The check engine light went out but came back on again. Any idea? 24 Answers

My truck wont pass smog.The original code was PO300. It was random misfire, I was told. I ask my buddy who is a mechanic in Arizona he advise me to change O2 sensor in stream bank 1 & 2. And to rese...

my check engine light came on and i got the code P0104, need a check list for this 3 Answers

My check engine light to my 2001 ford windstar came on, I have run a diagnostic on it and got the code P0104, could really use a check list as to what is causing this problem and would this code be ...

P1281: Cat Efficiency Below Threshold (Bank I) 13 Answers

I recently took my Dakota for an emissions test in Califonia and it failed the functional test. Didn't know that having a check engine light is an immediate failure else I would not have spent the $4...