BMW DTC P204B – Reductant Pressure Sensor Circuit Range/Performance
DTC P204B meaning on BMW
The Diagnostic Trouble Code (DTC) P204B for BMW refers to the Reductant Pressure Sensor Circuit Range/Performance. This code indicates that the signal from the reductant pressure sensor is outside the expected range or not performing within the specified parameters.
BMW DTC P204B symptoms
Symptoms of the DTC P204B on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Possible decrease in fuel efficiency
- Issues with the Selective Catalytic Reduction (SCR) system
BMW DTC P204B causes
Common causes of the DTC P204B on a BMW include:
- Faulty reductant pressure sensor
- Wiring or connector issues in the sensor circuit
- Corrosion or damage to sensor components
- Issues with the SCR system
BMW DTC P204B seriousness
The DTC P204B should not be ignored as it can lead to reduced engine performance and potential issues with emissions compliance. It is important to address this code promptly to ensure proper functioning of the SCR system and maintain optimal vehicle performance.
How to diagnose DTC P204B on BMW
To diagnose the DTC P204B on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the reductant pressure sensor and its wiring for any visible damage
- Test the sensor’s output signal using a multimeter
- Check for any leaks or blockages in the SCR system
How to fix DTC P204B on BMW
To fix the DTC P204B on a BMW, the following steps may be taken:
- Replace the faulty reductant pressure sensor
- Repair or replace any damaged wiring or connectors in the sensor circuit
- Clean or replace any components in the SCR system that may be causing the issue
- Clear the fault code and reset the Check Engine Light
How to erase DTC P204B on BMW
To erase the DTC P204B on a BMW, you can use a diagnostic scanner to clear the fault code from the vehicle’s memory. Once the issue has been addressed and fixed, clearing the code will reset the Check Engine Light and ensure that the system is functioning properly.
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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