BMW DTC P0104 – Mass or Volume Air Flow Sensor ‘A’ Circuit Intermittent
DTC P0104 meaning on BMW
DTC P0104 on a BMW indicates an intermittent issue with the Mass or Volume Air Flow Sensor ‘A’ circuit. This fault code is triggered when the Engine Control Module (ECM) detects a problem with the signal from the MAF sensor, which measures the amount of air entering the engine for proper fuel delivery.
BMW DTC P0104 symptoms
Symptoms of DTC P0104 on a BMW may include:
- Check Engine Light illuminated
- Reduced engine power
- Poor fuel economy
- Stalling or rough idling
BMW DTC P0104 causes
Common causes of DTC P0104 on a BMW include:
- Dirty or faulty MAF sensor
- Wiring or connector issues in the MAF sensor circuit
- Vacuum leaks in the intake system
- Air filter clogged or dirty
BMW DTC P0104 seriousness
While DTC P0104 may not cause immediate engine failure, it can lead to poor performance and reduced fuel efficiency. Ignoring this fault code can potentially cause further damage to the engine over time.
How to diagnose DTC P0104 on BMW
To diagnose DTC P0104 on a BMW, you can:
- Inspect the MAF sensor for dirt or damage
- Check the wiring and connectors for any signs of wear or corrosion
- Perform a visual inspection of the intake system for leaks
- Use a scan tool to monitor MAF sensor data and compare it to expected values
How to fix DTC P0104 on BMW
To fix DTC P0104 on a BMW, you can:
- Clean or replace the MAF sensor if dirty or faulty
- Repair any damaged wiring or connectors in the MAF sensor circuit
- Fix any vacuum leaks in the intake system
- Replace the air filter if clogged or dirty
How to erase DTC P0104 on BMW
To erase DTC P0104 on a BMW, you can:
- Use an OBD-II scanner to clear the fault code after the underlying issue has been resolved
- Ensure that the repair has been completed successfully before clearing the code
- Drive the vehicle for a short distance to allow the ECM to recheck the system and verify the repair
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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