P1148 - Closed Loop Control Function Bank 1
This mean that the closed loop control function for bank 1 does not operate even when vehicle is driving in the specified condition.
The Powertrain Control Module (PCM) or Electronic Control Module(ECM)
monitor the function of the Front Oxygen (O2) sensor or Air/Fuel (A/F)
sensor by comparing the signal with the Rear O2 sensor.
Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
Possible causes:
- Harness or connectors Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor 1 circuit is open or shorted.
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1
- Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1 heater
Possible solution:
- Repair harness or connector. If repair is needed
- Replaced Front Oxygen (O2) sensor or Air/Fuel (A/F) sensor bank 1
Then, possible causes are faulty harness or connectors to the air fuel ratio
sensor, a faulty air fuel ratio sensor (1) or faulty air fuel ratio
sensor (1) heater. Most likely yes it is just faulty sensor. Just replace this devices and reset the stored codes.
Keep us updated.
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