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2002 Pontiac Grand Prix SE 3.1L Excessive Emissions, Misfire, MIL Lamp on
Posted to GM Driveability on 5/7/2013 15 Replies

Came in with a p0420. Replaced cat, came back aprox 500 mi later with same code, replace cat again with a OE unit, and new front and rear O2's. Back again with p0420 and p0300 after aprox 50 mi. Cyl #4 has a very slight miss, cant feel it but the verus is show...

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  Related Documents & Media  2002 Pontiac Grand Prix SE

 
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car Vehicle Data

2002 Pontiac Grand Prix SE

VIN 1G2WK52J32
Engine3.1 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Misfire, MIL Lamp On
OccursIdle, Intermittently

Trouble Codes

P0300Multiple Misfire Detected
P0420Catalyst Efficiency Below Threshold (Bank 1)
Message Closed

car Vehicle Data

2002 Pontiac Grand Prix SE

VIN 1G2WK52J32
Engine3.1 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsExcessive Emissions, Misfire, MIL Lamp On
OccursIdle, Intermittently

Trouble Codes

P0300Multiple Misfire Detected
P0420Catalyst Efficiency Below Threshold (Bank 1)