Mixture Adaption Factor FRA Bank 2 Drive Cycle C

DTC P0175
Mixture adaption factor FRA bank 2 Drive cycle C:Signal out of range - above maximum.

Possible causes by suggested order of priority:
- Faulty injector (Low or high flow).
- Fuel pressure regulator fault - pressure incorrect.
- MAF sensor inaccurate.
- Fuel pump fault - flow too low.
- Part load breather pipe.

Faulty injector (Low or high flow).
- Fuelling adaption FRA is normal on bank A (left)
- There are no misfire faults set on the vehicle
- There are no oxygen sensor or catalyst faults set on bank B (right)
- Check Engine Roughness and misfire counts. Is one cylinder different from the others?
- Fuel injector flow rate too low (one injector bank B).
- Fuel injector flow rate too high (one injector bank B).
- Renew or temporarily substitute injector for any cylinder with abnormal engine roughness or misfire counts.
- Renew or temporarily substitute all injectors for bank B.
- Swap injectors with injectors from the opposite bank to see if fault can be transferred to opposite bank.

Fuel pressure regulator fault - pressure incorrect.
- Fuelling adaption FRA is also abnormal on bank A (left)
- There are no misfire faults set on the vehicle
- There are no oxygen sensor or catalyst faults set
- Fuel pressure too low (high FRA adaption).
- Fuel pressure too high (low FRA adaption).
- Fit fuel pressure gauge and measure fuel pressure.

MAF sensor inaccurate.
- Fuelling adaption FRA is also abnormal on bank A (left).
- There are no misfire faults set on the vehicle.
- There are no oxygen sensor or catalyst faults set.
- Fuel pressure (measured with pressure gauge) is correct.
- MAF sensor is functioning but inaccurate.
- Renew MAFS or test by substitution with known good unit.

Fuel pump fault - flow too low.
- Fuelling adaption FRA is abnormally high on both banks
- There are no misfire faults set on the vehicle
- There are no oxygen sensor or catalyst faults set
- Fuel pressure too low at high engine power due to poor fuel pump flow.
- Fit fuel pressure gauge and measure fuel pressure during driving at high engine revs.

Part load breather pipe.
- Part load breather pipe connections.
- State of the part load breather pipe for cracks etc.