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2003 Saturn Vue 3.0L Misfire
Posted to GM Driveability on 7/27/2011 10 Replies

Customer came in with vehicle that had codes. Po300 random misfire,[...] #1 misfire,po421 cat eff. low bank 1,p2b03 which I cannot find any info on.I monitored bank 1 o2 sensors and rear o2 mimicing front so I assume cat is faulty.I checked spark plugs and wer...

FIX posted 8/13/2011

10 Replies Received (View Replies)

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car Vehicle Data

2003 Saturn Vue

Engine3.0 L / 6 cyl / GAS
Trans5-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
OccursOn Decel

Trouble Codes

P0300Multiple Misfire Detected
P0301Cylinder 1 Misfire Detected
P0421Catalytic Converter Efficiency (Bank 1)
P2B03Cannot find any info