Mechanics

GMC SIERRA SENSOR PROBLEM

2003 GMC Sierra • 185,000 miles

Engine started running rough/stalling, got a diagnostic code of MAF, and then thermostat/sensor, and the O2 sensor bank 1.I replaced all 3 of these items but engine is still running rough.
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Rogerballesteros
January 1, 2013.




What were the codes?

Codes never identify bad parts, just failed systems.

Lets start with the code numbers

Roy
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This is how the codes came up.

P0128- Coolant Temp below Thermostat
P0101- mass air flow range
P0420- below threshold- bank 1

replaced
MAF
Distributor
O2 Sensor bank 1
thermostat/sensor

cleared codes- engine stalled again while idling

Tiny
Rogerballesteros
Jan 3, 2013.

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