2003 GMC Sierra Repair Question
GMC Sierra Sensor Problem
what were the codes???
codes never identify bad parts, just failed systems.
lets start with the code numbers
24,836 answers provided
This is how the codes came up.
P0128- Coolant Temp below Thermostat
P0101- mass air flow range
P0420- below threshold- bank 1
O2 Sensor bank 1
cleared codes- engine stalled again while idling
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