BMW DTC P1126 – Throttle Position Sensor A and B Circuit Range/Performance Large Error
DTC P1126 meaning on BMW
The Diagnostic Trouble Code (DTC) P1126 for BMW indicates an issue with the Throttle Position Sensor A and B Circuit Range/Performance Large Error. This means that the Engine Control Module (ECM) has detected a significant deviation in the signals from the throttle position sensors, which are responsible for monitoring the position of the throttle valve.
BMW DTC P1126 symptoms
Symptoms of the BMW DTC P1126 may include:
- Reduced engine power
- Poor acceleration response
- Engine stalling
- Check Engine Light (CEL) illuminated on the dashboard
BMW DTC P1126 causes
Common causes of the BMW DTC P1126 include:
- Faulty throttle position sensors
- Wiring or connector issues in the throttle position sensor circuit
- Throttle body malfunction
- ECM software issues
BMW DTC P1126 seriousness
The BMW DTC P1126 should be addressed promptly as it can lead to drivability issues and potential safety concerns. Ignoring this fault may result in further damage to engine components and increased risk of stalling while driving.
How to diagnose DTC P1126 on BMW
To diagnose the BMW DTC P1126, you can perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes and freeze frame data
- Inspect the throttle position sensors and their wiring for any visible damage
- Check the throttle body for proper operation and cleanliness
- Perform a throttle position sensor calibration using a diagnostic tool
How to fix DTC P1126 on BMW
To fix the BMW DTC P1126, you can try the following solutions:
- Replace the faulty throttle position sensors
- Repair any damaged wiring or connectors in the throttle position sensor circuit
- Clean or replace the throttle body if necessary
- Update the ECM software to the latest version
How to erase DTC P1126 on BMW
To erase the DTC P1126 on a BMW, you can use a diagnostic scanner to clear the fault codes stored in the ECM memory. After fixing the underlying issue causing the fault code, you can reset the codes to turn off the Check Engine Light and ensure the repair was successful.
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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