P1175
ModerateP1175 — Additive Fuel Trim at Limit, Bank 2
Description
What P1175 Means
Code P1175 indicates that additive fuel trim for bank 2 has reached its limit. The engine control unit (DME) can no longer correct the mixture toward richer or leaner within the range allowed for bank 2.
Additive fuel trim compensates for fuel delivery deviations at idle and low load. When the correction hits the limit, it points to unmetered air ingress or a fault in the crankcase ventilation (PCV) system affecting bank 2 specifically. P1175 is the same as P1174 but applies to bank 2.
The system involves the bank 2 oxygen sensors (lambda), the PCV valve and vacuum lines, the throttle body, and the mass air flow sensor (MAF).
Symptoms
Symptoms
- Poor idle
- High oil consumption
- Blue smoke from the exhaust
- Misfires
Causes and fixes
Diagnosis and Repair
- Check for vacuum leaks on bank 2.
- Inspect the PCV valve and its hoses.
- Clean or replace the MAF sensor.
- Reset the fuel trim adaptations.
Possible secondary damage
Secondary Damage
As with P1174, ignoring P1175 can lead to:
- misfires;
- catalytic converter damage;
- reduced fuel economy.