Questions & Answers for: p0420 bank1

codes p0303/p0420/p0700 what mean that P0420 Catalyst system below Efficiency Threshold (Bank1) p0303 Cylinder 3 Misfire Detected p0700 Transmission Control System Malfunction

...P0420'' The codes are System to rich (bank1) and Catalyst Efficiency below threshold (bank1) What does all that mean, what would need o be replaced? po-120 is--tps/pedal position sensor A curcuit ...

radiator. bank2 sensor 1. back side of motor next to the fire wall is bank1 sensor 1. the one behind the cat is bank1 sensor 2. make sure that is the problem. if code p0420 is the cat or cat's are bad

...P0420 means: catalyst system below threshold (bank1). DTC P0432 means: main catalyst efficiency below threshold (bank 2) it sounds as tho your catalyctic converter is shot not really a problem tho as ...

...3.high or low fuel pressure. P0420 1.catylist eff low bank1- cat can be defective. 2.eng misfire, vacuum leak. 3.engine oil leak into the exhaust valve guide seals. as for the warranty i dont

...p0420 catalyst system effciency below threshold (bank1) that your catalyst system has gotten to hot. or is broken on the inside check by tapping with a rubber hamer if it rattels then you may need a ...

o2 sensor problems o2 sensors set po 420 code. both sensors have been replaced The problem is NOT the O2 sensor, this code (p0420) indicates: P0420 Catalyst System Efficiency below Threshold(Bank1)

...engine misfire and p0420 is catalytic converter efficieny below threshhold bank1. one easily causes the other. only way to be sure you get it fixed would be a tune up, new cat converter and o2 ...

...p0420 and p1399 The problem occurred suddenly while accelerating. Now sputter badly. Ran fine before this. code po420 refers to cat converter system bank1 - efficiency below threshold===causes -- cat ...

...bank1 01 chevy impala i have put a new cat, upstream& downstream o2 sensor in but im still getting p0420 code When was the last time the spark plugs were changed? Any oil or antifreeze useage? NO ...