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2003 Chevrolet Silverado 1500 5.3L MIL Lamp on
Posted to GM Driveability on 2/18/2009 24 Replies

hey guys have this 03 silverado mass air flow code p0101 keeps coming up and now p0420 cat eff code. i replaced intake gaskets full tune i drove this vechicle 80 miles than light came back on same codes i also replace fuel pump and all o2 sensors i really do n...

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  Related Documents & Media  2003 Chevrolet Silverado 1500

 
Message Closed w/FIX

car Vehicle Data

2003 Chevrolet Silverado 1500

VIN 2GCEK19T03
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

P0101Mass Airflow Sensor Range/Performance
P0420Catalyst Efficiency Below Threshold (Bank 1)
Message Closed w/FIX

car Vehicle Data

2003 Chevrolet Silverado 1500

VIN 2GCEK19T03
Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsMIL Lamp On

Trouble Codes

P0101Mass Airflow Sensor Range/Performance
P0420Catalyst Efficiency Below Threshold (Bank 1)