BMW DTC P122F – NOx Sensor Binary Oxygen Sensor Signal Circuit Shorted (Bank 1)
DTC P122F meaning on BMW
The DTC P122F error code on a BMW indicates a fault with the NOx sensor binary oxygen sensor signal circuit in Bank 1. This means that there is a short circuit detected in the oxygen sensor signal circuit for the NOx sensor in the first bank of the engine.
BMW DTC P122F symptoms
Symptoms of the DTC P122F error code on a BMW may include:
- Check Engine Light (CEL) illuminated on the dashboard
- Reduced engine performance
- Increased fuel consumption
- Engine running rough or misfiring
BMW DTC P122F causes
Common causes of the DTC P122F error code on a BMW include:
- Short circuit in the NOx sensor binary oxygen sensor signal circuit
- Wiring harness issues
- Faulty NOx sensor
- ECU (Engine Control Unit) malfunction
BMW DTC P122F seriousness
The DTC P122F error code should not be ignored as it can lead to reduced engine performance, increased emissions, and potential damage to the engine components. It is recommended to address this issue promptly to prevent further complications.
How to diagnose DTC P122F on BMW
To diagnose the DTC P122F error code on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the wiring harness for any visible damage or corrosion
- Check the NOx sensor for proper operation
- Test the oxygen sensor signal circuit for continuity and shorts
- Verify the ECU functionality
How to fix DTC P122F on BMW
To fix the DTC P122F error code on a BMW, you can try the following solutions:
- Repair or replace any damaged wiring in the oxygen sensor signal circuit
- Replace the faulty NOx sensor if necessary
- Reset the ECU and clear the fault codes
- Perform a test drive to ensure the issue is resolved
How to erase DTC P122F on BMW
To erase the DTC P122F error code on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECU memory. Once the codes are cleared, you can reset the ECU to ensure the error code does not reappear.
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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