BMW DTC P1118 – Mass or Volume Air Flow Circuit Circuit High (Bank 2)
DTC P1118 meaning on BMW
The DTC P1118 code on a BMW indicates an issue with the Mass or Volume Air Flow Circuit being too high in Bank 2. This means that the engine control module (ECM) has detected a higher than normal voltage signal from the Mass Air Flow (MAF) sensor in Bank 2, which measures the amount of air entering the engine.
BMW DTC P1118 symptoms
Symptoms of a DTC P1118 on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Poor fuel economy
- Rough idling or stalling
BMW DTC P1118 causes
The common causes of a DTC P1118 on a BMW include:
- Faulty Mass Air Flow (MAF) sensor
- Dirty or contaminated MAF sensor
- Vacuum leaks in the intake system
- Wiring or connector issues in the MAF circuit
BMW DTC P1118 seriousness
While a DTC P1118 may not cause immediate engine failure, it can lead to poor engine performance and reduced fuel efficiency. Ignoring this code can potentially cause further damage to the engine over time.
How to diagnose DTC P1118 on BMW
To diagnose a DTC P1118 on a BMW, you can perform the following steps:
- Use an OBD-II scanner to retrieve the fault codes and freeze frame data
- Inspect the MAF sensor for any visible damage or contamination
- Check for vacuum leaks in the intake system
- Test the MAF sensor using a multimeter to verify its functionality
- Inspect the wiring and connectors in the MAF circuit for any issues
How to fix DTC P1118 on BMW
To fix a DTC P1118 on a BMW, you can try the following solutions:
- Clean or replace the Mass Air Flow (MAF) sensor
- Repair any vacuum leaks in the intake system
- Repair or replace any damaged wiring or connectors in the MAF circuit
- Reset the ECM and clear the fault codes
How to erase DTC P1118 on BMW
To erase a DTC P1118 on a BMW, you can use an OBD-II scanner to clear the fault codes stored in the ECM. Once the issue has been resolved and the fault codes cleared, the Check Engine Light should turn off.
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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