BMW DTC P118C – Engine Oil Separator Heating Circuit/Open
DTC P118C meaning on BMW
The DTC P118C fault code on BMW vehicles indicates an issue with the Engine Oil Separator Heating Circuit being open. This means that there is a problem with the electrical circuit responsible for heating the engine oil separator, which can impact the proper functioning of the vehicle’s emission control system.
BMW DTC P118C symptoms
Symptoms of the DTC P118C code on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Reduced engine performance
- Increased fuel consumption
- Engine stalling or rough idling
BMW DTC P118C causes
The common causes of the DTC P118C fault code on BMW vehicles include:
- Faulty engine oil separator heating element
- Wiring or connector issues in the heating circuit
- Defective engine control module (ECM)
BMW DTC P118C seriousness
While the DTC P118C code may not cause immediate drivability issues, it is important to address it promptly to prevent potential damage to the vehicle’s emission control system and ensure optimal engine performance.
How to diagnose DTC P118C on BMW
To diagnose the DTC P118C fault code on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the engine oil separator heating circuit for any visible damage or loose connections
- Test the engine oil separator heating element for continuity and proper operation
- Check the ECM for any stored codes or malfunctions
How to fix DTC P118C on BMW
To fix the DTC P118C fault code on a BMW, the following steps may be taken:
- Replace the faulty engine oil separator heating element
- Repair any damaged wiring or connectors in the heating circuit
- If necessary, replace the engine control module (ECM)
- Clear the fault code and perform a test drive to ensure the issue has been resolved
How to erase DTC P118C on BMW
To erase the DTC P118C fault code on a BMW, a diagnostic scanner can be used to clear the code from the vehicle’s ECM memory. After the repair has been completed and the fault code erased, it is recommended to perform a test drive to confirm that the issue has been successfully resolved.
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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