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P0131 Diagnostic Trouble Code Discussion for January 2009

Air Fuel Sensor (Bank 1 Sensor 1) Circuit Low Input (Lean Shift)

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Trouble Ticket Help Requests for DTC P0131
Help Request Posted
2006 GMC Sierra 1500 WT 4.8L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on, sluggish VIN: 3GTEC14V76
P0131: Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage. Customer complains of rough idle, sluggish, cel on. Above listed codes are confirmed. Misfire counters are very high on cyls. # 1,3,5,7, very low on #2,4,6,8.. HC slightly high O2 high at tailpipe, C0 low. Can enrich to get O2 to go high but at idle, O2 at .03...
January 14, 2009
1997 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 1GCEK19R1V
P0131: Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage. i have a problem child here, this truck has a missfire on cylinders 2 & 6 constantly, seems to be fireing out exhaust at least partially. heres where we started, scan for codes found codes as noted also noted no sync pid on scanner and mass flow flatlined,...
January 28, 2009