BMW DTC U1144 – Lost Communication With NOx Sensor (Bank 1)
DTC U1144 meaning on BMW
The Diagnostic Trouble Code (DTC) U1144 for BMW indicates a communication error with the NOx (Nitrogen Oxide) sensor located in Bank 1 of the vehicle. This error means that the Engine Control Module (ECM) is unable to receive data from the NOx sensor, which is crucial for monitoring and controlling emissions.
BMW DTC U1144 symptoms
Symptoms of the U1144 DTC on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Potential increase in emissions
BMW DTC U1144 causes
The U1144 DTC in a BMW can be caused by various factors, including:
- Wiring or connection issues between the NOx sensor and the ECM
- Defective NOx sensor
- Faulty ECM
BMW DTC U1144 seriousness
The U1144 DTC should not be ignored as it can lead to increased emissions and potential engine performance issues. It is important to address this code promptly to ensure proper vehicle operation and compliance with emissions regulations.
How to diagnose DTC U1144 on BMW
To diagnose the U1144 DTC on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring and connections to the NOx sensor
- Test the NOx sensor for proper functionality
- Check the ECM for any faults or malfunctions
How to fix DTC U1144 on BMW
To fix the U1144 DTC on a BMW, you may need to:
- Repair any damaged wiring or connections
- Replace the faulty NOx sensor
- If necessary, replace the ECM
How to erase DTC U1144 on BMW
To erase the U1144 DTC on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes
- Ensure that the underlying issue causing the code has been resolved
- Perform a test drive to confirm that the code does not return
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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