Code PO420 is catalytic converter efficiency low bank 1
catalyst system fault
Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
Po420 2001chevy lmpala
Do didn't say which engine you have. The trouble code PO420 is telling you there is a catalystic converter not doing it's job. We need to know which engine and what year you have in order to determine which cat is at fault.
It's Catalyst system efficiency below threshold
Catalyst efficiency below threshold. (The catalytic converter may be failing.)
What is a PO420 in a 2002 mercury cougar: Now if your car is 2.0L DOHC. OBD ll PO420 : Catalyst Efficiency Below Threshold (BANK 1). Hope this helps...
Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)
PO420 is catalystis efficency low bank 1. That is referring to the catalytic convertor bank 1.
You assumed that Code PO420 Catalysis System Efficiency Below Threshold (Bank 1) meant the converter was bad? Not necessarily so. It can be an exhaust leak, defective O2 sensor on bank 1, engine coolant sensor is defective, leaking fuel injector, cylinder misfire, or problem with wiring on O2 sensor.
Trouble code P0340 means:Camshaft position sensor "A"-circuit malfunction (Bank 1) Trouble code P0420 means:Catalyst system efficiency below threshold (bank 1)