P126A – BMW DTC

BMW DTC P126A – NOx Sensor Signal / Signal Linear Oxygen Sensor Correlation (Bank 1)

DTC P126A meaning on BMW

DTC P126A on a BMW indicates a problem with the NOx sensor signal or signal linear oxygen sensor correlation in Bank 1. This fault code is specifically related to the correlation between the NOx sensor and the oxygen sensor in the exhaust system of the vehicle.

BMW DTC P126A symptoms

Symptoms of DTC P126A on a BMW may include:

• Check Engine Light (MIL) illuminated
• Reduced engine performance
• Increased fuel consumption
• Possible exhaust emissions issues

BMW DTC P126A causes

Common causes of DTC P126A on a BMW include:

• Failed NOx sensor
• Malfunctioning oxygen sensor
• Wiring or connector issues
• Exhaust system leaks

BMW DTC P126A seriousness

DTC P126A should not be ignored as it can lead to increased emissions, reduced fuel efficiency, and potential engine performance issues. It is important to address this fault code promptly to prevent further damage to the vehicle.

How to diagnose DTC P126A on BMW

To diagnose DTC P126A on a BMW, you can follow these steps:

1. Use a diagnostic scanner to retrieve the fault code
2. Inspect the NOx sensor and oxygen sensor for any visible damage
3. Check the wiring and connectors for any signs of wear or corrosion
4. Perform a sensor test to verify functionality

How to fix DTC P126A on BMW

To fix DTC P126A on a BMW, you may need to:

1. Replace the faulty NOx sensor or oxygen sensor
2. Repair any damaged wiring or connectors
3. Address any exhaust system leaks
4. Clear the fault code and reset the Check Engine Light

How to erase DTC P126A on BMW

To erase DTC P126A on a BMW, you can:

1. Use a diagnostic scanner to clear the fault code
2. Ensure that the underlying issue has been resolved
3. Perform a test drive to confirm the repair

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.