Questions & Answers for: Mazda Protege p0420 code

code is P0420. Catalyst efficiency below threshold (Bank 1). Had converter checked and it was ok. There is a oxygen sensor before the converter and one after the converter. Which oxygen sensor is Bank

...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 have the same reading.info on both sensors are ...

...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: 2.3% INTAKE MANIFOLD PRESS:19.1in.h9 ENGINE RPM: ...

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 hose creaked , so i replaced it right