BMW DTC P1271 – Ambient Air Pressure Sensor Electrical (M73: Altitude Pressure Sensor / Charging Pressure Value Comparison Plausibility)
DTC P1271 meaning on BMW
DTC P1271 on a BMW refers to an issue with the Ambient Air Pressure Sensor Electrical circuit. Specifically, it relates to the M73 Altitude Pressure Sensor or Charging Pressure Value Comparison Plausibility. This fault code indicates that there is a discrepancy between the expected pressure values and the actual readings from the sensor.
BMW DTC P1271 symptoms
Symptoms of DTC P1271 on a BMW may include:
- Check Engine Light illuminated
- Reduced engine performance
- Potential rough idling or stalling
- Decreased fuel efficiency
BMW DTC P1271 causes
Common causes of DTC P1271 on a BMW include:
- Faulty Ambient Air Pressure Sensor
- Wiring or connector issues in the sensor circuit
- Interference from other electrical components
- Software or calibration issues
BMW DTC P1271 seriousness
While DTC P1271 may not always result in immediate drivability issues, it is important to address this fault code promptly. Ignoring this problem can lead to potential engine performance issues and decreased fuel efficiency over time.
How to diagnose DTC P1271 on BMW
To diagnose DTC P1271 on a BMW, you can follow these steps:
- Use a diagnostic scanner to retrieve the fault code and freeze frame data
- Inspect the Ambient Air Pressure Sensor and its wiring for any visible damage
- Check for loose or corroded connectors in the sensor circuit
- Perform a sensor output test to verify its functionality
- Compare the sensor readings with a known good value
How to fix DTC P1271 on BMW
To fix DTC P1271 on a BMW, you can try the following solutions:
- Replace the Ambient Air Pressure Sensor if it is found to be faulty
- Repair any damaged wiring or connectors in the sensor circuit
- Clear the fault code and perform a test drive to verify the repair
- If the issue persists, further diagnosis may be required
How to erase DTC P1271 on BMW
To erase DTC P1271 on a BMW, you can use a diagnostic scanner to clear the fault code from the vehicle’s memory. After performing the necessary repairs and confirming the issue is resolved, you can reset the Check Engine Light and erase the fault code to ensure it 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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