Questions & Answers for: Mazda Protege p0420

Check engine light. Check engine light is on. The error code is P0420. Catalyst efficiency below threshold (Bank 1). Had converter checked and it was ok. There is a oxygen sensor before the converter ...

1999 Mazda Protege ES/1.8L Manual Trans Have code P0420.replaced both o2 sensors,still have same code.This is the only code showing.Cleared mil light and went through another drive cycle and still ...

what do i need/how to fix a 1996 saturn 1.8 dual with code p0420 FREEZE FRAME DATA: FUEL SYSTEM 1: CLOSED LOOP CALCULATED LOAD: 49% ENGINE COOLANT TEMP: 195 DEGREES F STFT BANK 1: -1.5% LTFT BANK 1: 2

...rail and turned the key, and gas spewed out. The check engine light had been on for a while for P0420 catalyst efficiency, so I "improved" the flow through the catalyst. It still wont run. I've ...

p0420 p0171 From last one year i had p0420 code , its came when i got water in spark plugs and my car got some miss fires , after few days that code came . now one day i saw that my car's air ...