BMW DTC P0721 – Output Shaft Speed Sensor Circuit Range/Performance
DTC P0721 meaning on BMW
The Diagnostic Trouble Code (DTC) P0721 for BMW indicates a fault in the Output Shaft Speed Sensor Circuit. This code is triggered when the Engine Control Module (ECM) detects that the signal from the output shaft speed sensor is outside the expected range or is not performing within the specified parameters.
BMW DTC P0721 symptoms
Symptoms of a DTC P0721 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Transmission shifting issues or erratic shifting
- Harsh or delayed gear changes
- Limp mode activation
BMW DTC P0721 causes
Common causes of a DTC P0721 on a BMW include:
- Defective output shaft speed sensor
- Wiring or connector issues in the output shaft speed sensor circuit
- Faulty ECM
- Mechanical issues in the transmission
BMW DTC P0721 seriousness
The seriousness of a DTC P0721 on a BMW should not be ignored as it can lead to potential transmission problems and affect the overall drivability of the vehicle. It is recommended to address this issue promptly to prevent further damage.
How to diagnose DTC P0721 on BMW
To diagnose a DTC P0721 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and related data
- Inspect the output shaft speed sensor and its wiring for any visible damage or corrosion
- Perform a resistance test on the sensor to check for proper functionality
- Check the transmission fluid level and condition
- Inspect the ECM for any signs of damage or malfunction
How to fix DTC P0721 on BMW
To fix a DTC P0721 on a BMW, you can try the following:
- Replace the output shaft speed sensor if it is found to be faulty
- Repair or replace any damaged wiring or connectors in the sensor circuit
- If the ECM is determined to be the issue, reprogram or replace it as necessary
- Address any mechanical problems in the transmission that may be causing the fault
How to erase DTC P0721 on BMW
To erase a DTC P0721 on a BMW, you can use a diagnostic scanner to clear the code after the underlying issue has been resolved. This will reset the Check Engine Light and allow you to monitor the system for any recurring faults.
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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