Error code P0175 is displayed and the check engine light is on - what does this mean?
The OBD/EOBD system detects a fuel mixture in bank 2 of the engine that is too rich. This DTC P0175 indicates that the oxygen sensor or the lambda probe has registered an unbalanced air-fuel mixture. With different manufacturers such as BMW, Mercedes-Benz or Audi, this error code can have slightly different effects on the engine control unit.
What causes can this error code have?
- Defective lambda sensor in bank 2
- Clogged or dirty air filter
- Defective mass air flow sensor (MAF sensor)
- Leaking fuel injectors
- Damaged fuel pressure regulator
- Defective crankcase ventilation (PCV valve)
- Leaks in the intake tract
- Dirty or defective throttle valve
- Faulty engine control unit (ECU)
- Defective fuel pump with excessive pressure
What symptoms occur in parallel with fault code P0175?
- Increased fuel consumption: The vehicle consumes significantly more fuel than usual
- Black smoke from the exhaust: Particularly visible when accelerating
- Uneven engine running: The engine runs unevenly or jerks when idling
- Loss of power: Noticeable reduction in engine power when accelerating
- Strong smell of fuel: Perceptible fuel vapors inside or outside the vehicle
- Starting problems: Difficulty starting the engine, especially in cold weather
How can the problem with error code P0175 be resolved?
- Repairing this trouble code requires a systematic diagnosis of the fuel and air supply.
- Replacement of the defective lambda sensor in bank 2 after prior measurement of the sensor signals and resistance values
- Cleaning or replacing the air filter and checking the entire air intake system for leaks
- Replacement of the mass air flow sensor after checking the measured values at idling speed and under load
- Professional cleaning or replacement of the fuel injectors including checking the injection patterns
- Replacement of the fuel pressure regulator after measuring the fuel pressure in the system
- Replacement of the PCV valve and inspection of the complete crankcase ventilation for proper function
- Repair of leaks in the intake tract by replacing damaged hoses or seals
FAQ - Frequently asked questions about DTC P0175
Can I continue driving with error code P0175?
Driving is possible in the short term, but you should have the fault code rectified as soon as possible. The increased fuel consumption and possible consequential damage to the catalytic converter can be expensive.
How much does it cost to repair fault code P0175?
The costs vary depending on the cause: air filter 20-50€, lambda sensor 80-200€, mass air flow sensor 150-300€, fuel injectors 200-600€. The diagnosis costs an additional €50-100.
How can I tell whether error code P0175 has really been rectified?
After the repair, the EOBD memory should be deleted and a test drive carried out. If the code does not return after several driving cycles, the problem has been rectified.
Can I repair error code P0175 myself?
Simple measures such as changing the air filter are possible. For more complex repairs to the lambda sensors or fuel system, you should visit a specialist workshop.
What consequential damage can error code P0175 cause?
In the long term, the rich mixture can damage the catalytic converter, which can result in repair costs of €800-2000. Spark plugs and the engine itself can also be damaged.
How often does error code P0175 occur in older vehicles?
This OBD code is more common in vehicles over 100,000 km, as lambda sensors and other sensors wear out with age. Regular maintenance can reduce the risk.
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