BMW DTC P1170 – Post Catalyst Fuel Trim System Correction Value above Threshold (Bank 2)
DTC P1170 meaning on BMW
The Diagnostic Trouble Code (DTC) P1170 on BMW indicates an issue with the Post Catalyst Fuel Trim System Correction Value above Threshold in Bank 2. This means that the fuel trim system in the post-catalytic converter area of the engine is detecting a deviation from the expected fuel mixture, potentially leading to inefficient combustion and increased emissions.
BMW DTC P1170 symptoms
Symptoms of BMW DTC P1170 may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Decreased fuel efficiency
- Engine running rough or misfiring
- Reduced engine performance
BMW DTC P1170 causes
Common causes of BMW DTC P1170 include:
- Leaking or faulty fuel injectors
- Problems with the oxygen sensors
- Issues with the catalytic converter
- Vacuum leaks in the intake system
- Malfunctioning Mass Airflow Sensor (MAF)
BMW DTC P1170 seriousness
Ignoring BMW DTC P1170 can lead to:
- Increased emissions
- Reduced fuel efficiency
- Potential damage to the catalytic converter
- Long-term engine performance issues
How to diagnose DTC P1170 on BMW
To diagnose BMW DTC P1170, you can:
- Use an OBD-II scanner to retrieve the fault codes
- Inspect the fuel injectors for leaks or malfunctions
- Check the oxygen sensors for proper operation
- Examine the catalytic converter for damage
- Perform a smoke test to detect vacuum leaks
How to fix DTC P1170 on BMW
To fix BMW DTC P1170, you may need to:
- Replace leaking or faulty fuel injectors
- Repair or replace malfunctioning oxygen sensors
- Address issues with the catalytic converter
- Fix any vacuum leaks in the intake system
- Clean or replace a faulty Mass Airflow Sensor (MAF)
How to erase DTC P1170 on BMW
To erase BMW DTC P1170, you can:
- Use an OBD-II scanner to clear the fault codes
- Fix the underlying issue causing the fault code
- After fixing the issue, clear the codes again to ensure they do not return
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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