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2000 Oldsmobile Alero GX 2.4L Hesitation
Posted to GM Driveability on 2/15/2008 9 Replies

this car has had 4 aftermarket cats installed. avging 1 1/2 months between code reappearing(p0420). 2 time there were missfire codes with the cat code. all scan reading seem normal. we have reprogramed the ecm also. any help would be greatly appreciated

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car Vehicle Data

2000 Oldsmobile Alero GX

VIN 1G3NK52T9Y
Engine2.4 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsHesitation
OccursHot

Trouble Codes

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

car Vehicle Data

2000 Oldsmobile Alero GX

VIN 1G3NK52T9Y
Engine2.4 L / 4 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsHesitation
OccursHot

Trouble Codes

P0300Multiple Misfire Detected
P0420Catalyst Efficiency Below Threshold (Bank 1)