BMW DTC P126E – NOx Sensor Signal Binary Oxygen Sensor Signal Too Rich During Deceleration Test (Bank 1)
DTC P126E meaning on BMW
DTC P126E on a BMW indicates that the NOx sensor signal binary oxygen sensor signal is too rich during deceleration test on Bank 1. This means that the engine control module (ECM) has detected a rich air-fuel mixture in the exhaust gases during deceleration, which can lead to increased emissions of nitrogen oxides (NOx).
BMW DTC P126E symptoms
Symptoms of DTC P126E on a BMW may include:
- Check Engine Light (CEL) illuminated
- Decreased fuel efficiency
- Engine running rough or misfiring
- Increased emissions
BMW DTC P126E causes
Possible causes of DTC P126E on a BMW include:
- Faulty NOx sensor
- Issues with the binary oxygen sensor
- Exhaust leaks
- Incorrect air-fuel mixture
- ECM software issues
BMW DTC P126E seriousness
DTC P126E should not be ignored as it can lead to increased emissions and potential damage to the catalytic converter. It is important to address this issue promptly to ensure optimal engine performance and reduce harmful emissions.
How to diagnose DTC P126E on BMW
To diagnose DTC P126E on a BMW, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the NOx sensor and binary oxygen sensor for any visible damage
- Check for exhaust leaks or other issues that may affect the air-fuel mixture
- Perform a thorough inspection of the engine components related to the emission system
How to fix DTC P126E on BMW
To fix DTC P126E on a BMW, you can try the following solutions:
- Replace the faulty NOx sensor or binary oxygen sensor
- Repair any exhaust leaks or issues affecting the air-fuel mixture
- Update the ECM software if necessary
- Perform a reset of the ECM to clear the fault code
How to erase DTC P126E on BMW
To erase DTC P126E on a BMW, you can use a diagnostic scanner to clear the fault code from the ECM memory. Once the issue has been addressed and fixed, you can reset the ECM to ensure the fault code is no longer present.
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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