BMW DTC P124C – NOx Sensor Signal Not Available On Startup (Bank 1)
DTC P124C meaning on BMW
DTC P124C on a BMW indicates that the NOx (Nitrogen Oxide) sensor signal is not available upon startup for Bank 1. The NOx sensor is responsible for monitoring and controlling the level of nitrogen oxides in the exhaust gases, helping the vehicle to comply with emissions regulations.
BMW DTC P124C symptoms
Symptoms of DTC P124C on a BMW may include:
- Check Engine Light (MIL) illuminated
- Reduced engine performance
- Increased fuel consumption
- Possible emission of higher levels of nitrogen oxides
BMW DTC P124C causes
Common causes of DTC P124C on a BMW include:
- Defective NOx sensor
- Wiring or connector issues in the NOx sensor circuit
- Software or calibration issues
- Exhaust system leaks
BMW DTC P124C seriousness
DTC P124C should not be ignored as it can lead to increased emissions and potential non-compliance with environmental regulations. Additionally, prolonged exposure to high levels of nitrogen oxides can be harmful to the environment and human health.
How to diagnose DTC P124C on BMW
To diagnose DTC P124C on a BMW, you can:
- Use a diagnostic scanner to retrieve the fault codes and data related to the NOx sensor
- Inspect the wiring and connectors for any damage or corrosion
- Perform a visual inspection of the exhaust system for leaks
- Test the NOx sensor using a multimeter or specialized diagnostic tool
How to fix DTC P124C on BMW
To fix DTC P124C on a BMW, you may need to:
- Replace the faulty NOx sensor
- Repair or replace damaged wiring or connectors in the NOx sensor circuit
- Update the software or calibration of the engine control module
- Repair any exhaust system leaks
How to erase DTC P124C on BMW
To erase DTC P124C on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes after the necessary repairs have been made
- Perform a test drive to ensure the issue has been resolved
- If the fault code reappears, further diagnosis may be required
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.