2003 GMC SIERRA
185,000 MILES
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ROGERBALLESTEROS
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  • 2 POSTS
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.
Jan 1, 2013 at 10:34 PM
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ASEMASTER6371
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what were the codes???

codes never identify bad parts, just failed systems.

lets start with the code numbers

Roy
Jan 1, 2013 at 10:40 PM
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ROGERBALLESTEROS
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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
Jan 3, 2013 at 4:26 AM
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