BMW DTC P122C – NOx Sensor Circuit Shorted (Bank 1)
DTC P122C meaning on BMW
DTC P122C on a BMW indicates a fault with the NOx (Nitrogen Oxide) sensor circuit in Bank 1. This code specifically points to a short circuit in the NOx sensor circuit of the vehicle.
BMW DTC P122C symptoms
Symptoms of DTC P122C on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Possible increase in emissions
BMW DTC P122C causes
Common causes of DTC P122C on a BMW include:
- Short circuit in the NOx sensor circuit
- Wiring issues or damaged wiring harness
- Faulty NOx sensor
BMW DTC P122C seriousness
DTC P122C should not be ignored as it can lead to increased emissions and potential engine performance issues. It is important to address this fault promptly to ensure proper vehicle operation and compliance with emissions regulations.
How to diagnose DTC P122C on BMW
To diagnose DTC P122C on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault code
- Inspect the wiring and connectors in the NOx sensor circuit for any visible damage
- Test the NOx sensor for proper functionality
How to fix DTC P122C on BMW
To fix DTC P122C on a BMW, the following steps may be taken:
- Repair any damaged wiring or connectors in the NOx sensor circuit
- Replace the faulty NOx sensor if necessary
- Clear the fault code and perform a test drive to ensure the issue is resolved
How to erase DTC P122C on BMW
To erase DTC P122C on a BMW, you can use a diagnostic scanner to clear the fault code from the vehicle’s memory. Once the repair has been completed and the issue resolved, clearing the fault code will reset the Check Engine Light and ensure 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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