BMW DTC P1175 – Fuel Trim Adaptation Additive Malfunction (Bank 2)
DTC P1175 meaning on BMW
The DTC P1175 for BMW indicates a Fuel Trim Adaptation Additive Malfunction on Bank 2. This fault code is related to the fuel mixture being either too rich or too lean on the second bank of cylinders in the engine.
BMW DTC P1175 symptoms
Symptoms of DTC P1175 on a BMW may include:
- Check Engine Light (MIL) illuminated
- Decreased fuel efficiency
- Rough idling or engine misfires
- Lack of power or hesitation during acceleration
BMW DTC P1175 causes
The common causes of DTC P1175 on a BMW include:
- Faulty oxygen sensor
- Vacuum leaks in the intake system
- Fuel pressure regulator issues
- Dirty or clogged fuel injectors
- Issues with the mass airflow sensor (MAF)
BMW DTC P1175 seriousness
While DTC P1175 may not cause immediate drivability issues, it can lead to poor engine performance and decreased fuel efficiency if left unresolved. Ignoring this fault code may result in potential damage to the engine components over time.
How to diagnose DTC P1175 on BMW
To diagnose DTC P1175 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the oxygen sensor readings and fuel trims for Bank 2
- Check for vacuum leaks in the intake system
- Test the fuel pressure and fuel injectors
- Inspect the MAF sensor for any issues
How to fix DTC P1175 on BMW
To fix DTC P1175 on a BMW, the following steps may be taken:
- Replace the faulty oxygen sensor on Bank 2
- Repair any vacuum leaks in the intake system
- Address any fuel pressure regulator issues
- Clean or replace clogged fuel injectors
- Clean or replace the mass airflow sensor (MAF)
How to erase DTC P1175 on BMW
After fixing the underlying issue causing DTC P1175 on a BMW, the fault code can be erased using a diagnostic scanner. This will clear the code from the vehicle’s memory and turn off the Check Engine Light. It is important to ensure that the repair has been successful before clearing the fault code.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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