Questions & Answers for: Pontiac Firebird p0420 code

...p0420 code changed both after cat 02 sensors. after 120 miles, service engine soon light came back on , only 42,000 miles on car. Is the cat bad? the light can be caused by any one or combination of ...

the car excelerates then feels like it short off and shuts down code reader gave me this code p305 p420 P0305 is a misfire on cyl. # 5 P0420 is catalyst efficency below threshold

1999 Firebird SES Codes P0420 and P1404 '99 FireBird V6 134500mi my SES light came on again with the below codes: DTC P0420 Catalyst System Low Efficiency DTC P1404 Exhaust Gas Recirculation (EGR) ...

engine codes p1518, p0125, and p0420 for 2001 firebird engine codes p1518, p0125, and p0420 for 2001 pontiac firebird 3.8L V6. need explination and possible solutions. shakes a bit at idle but seems ...

for 1999 pontiac firebird It's a code P0420. This is the code for saying that the Catalytic Convertor Efficiency is below threshold on Bank 1. To summ it all up, you need a new Catalytic Convertor

CODE P1870,P0420 WHAT IS TROUBLE CODE P1870,P0420 P1870 generally means that the transmission is slipping. P0420 relates to an issue with a vehicles catalytic converter. To know specifically what each

car code p0420 Failed Exhaust Converter on Bank #1 Replace it after you find out why it failed Ignition misfires Rich Fuel Condition Vacuum Leaks No Maintenance done for years

what is engine code p0420 engine code usually its a plugged exhaust or catalytic convertor