BMW DTC P04E4 – Crankcase Ventilation Hose Connection Sensor Circuit Intermittent/Erratic
DTC P04E4 meaning on BMW
The DTC P04E4 on a BMW indicates a fault with the Crankcase Ventilation Hose Connection Sensor Circuit being intermittent or erratic. This fault code is related to the sensor that monitors the connection of the crankcase ventilation hose in the vehicle’s engine system.
BMW DTC P04E4 symptoms
Symptoms of the DTC P04E4 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Engine running rough or misfiring
- Decreased engine performance
- Increased fuel consumption
BMW DTC P04E4 causes
Common causes of the DTC P04E4 on a BMW include:
- Loose or damaged crankcase ventilation hose
- Faulty crankcase ventilation hose connection sensor
- Wiring issues in the sensor circuit
BMW DTC P04E4 seriousness
While the DTC P04E4 may not cause immediate drivability issues, it is important to address this fault as it can lead to engine performance problems and potentially affect the overall operation of the vehicle.
How to diagnose DTC P04E4 on BMW
To diagnose the DTC P04E4 on a BMW, a mechanic would typically perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the crankcase ventilation hose and its connection for any visible damage or looseness
- Test the crankcase ventilation hose connection sensor for proper operation
- Check the wiring and connectors in the sensor circuit for any issues
How to fix DTC P04E4 on BMW
To fix the DTC P04E4 on a BMW, the following steps may be taken:
- Repair or replace any damaged or loose crankcase ventilation hose
- Replace the faulty crankcase ventilation hose connection sensor
- Repair any wiring issues in the sensor circuit
- Clear the fault code and reset the Check Engine Light
How to erase DTC P04E4 on BMW
To erase the DTC P04E4 on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s engine control module. Once the issue has been addressed and fixed, the code can be cleared to reset the Check Engine Light.
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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