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P1128 Diagnostic Trouble Code Discussion for July 2009

Closed Loop Fueling Not Achieved - Bank 1

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Trouble Ticket Help Requests for DTC P1128
Help Request Posted
2009 Dodge Ram 1500 ST 4.7L Surge, MIL Lamp on VIN: 1D3HV18P69
P1128: closed loop fueling not achieved bank 1. Drivability concern comes & goes,but 02 codes are staying active every time till vehicle is shut down.Downstream 02s are now staying around 4.8 V.(5v) biased sensors).All code charts produce the exspected results.Have run redundant wires w/ no change.Just ...
July 06, 2009