Posts Tagged: P1128

Diagnose P1128 Chrysler vehicles

Diagnose and fix P1128 Chrysler, Dodge, Jeep A P1128 Closed Loop Fueling Not Achieved – Bank 1 means that the PCM isn’t seeing the O2 readings it needs to change from open loop (default factory programming determines air/fuel mixture) to closed loop (PCM varies air/fuel mixture based on live readings from all sensors). If order to set a P1128 trouble code, the PCM must see that the O2 sensor on bank 1 hasn’t met the conditions to go into closed loop at least one time on each of two consecutive … Read More