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P2A39 – BMW DTC

BMW DTC P2A39 – O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3

DTC P2A39 meaning on BMW

DTC P2A39 on a BMW indicates an issue with the O2 Sensor Positive Current Control Circuit Low for Bank 1 Sensor 3. This means that the control module has detected a lower than expected voltage in the circuit that controls the O2 sensor’s positive current for the third sensor on bank 1.

BMW DTC P2A39 symptoms

Symptoms of DTC P2A39 on a BMW may include:

  • Check Engine Light illuminated
  • Poor fuel economy
  • Engine running rough
  • Reduced engine performance

BMW DTC P2A39 causes

Common causes of DTC P2A39 on a BMW include:

  • Faulty O2 sensor
  • Wiring or connector issues in the O2 sensor circuit
  • Issues with the control module
  • Exhaust leaks

BMW DTC P2A39 seriousness

While DTC P2A39 may not cause immediate drivability issues, it can lead to poor engine performance and reduced fuel efficiency. Ignoring this DTC can potentially cause further damage to the vehicle over time.

How to diagnose DTC P2A39 on BMW

To diagnose DTC P2A39 on a BMW, you can:

  1. Use a diagnostic scanner to retrieve the fault codes
  2. Inspect the wiring and connectors in the O2 sensor circuit
  3. Test the O2 sensor for proper operation
  4. Check for exhaust leaks

How to fix DTC P2A39 on BMW

To fix DTC P2A39 on a BMW, you may need to:

  1. Replace the faulty O2 sensor
  2. Repair any wiring or connector issues in the circuit
  3. Address any exhaust leaks
  4. If the issue persists, consult a professional mechanic for further diagnosis

How to erase DTC P2A39 on BMW

To erase DTC P2A39 on a BMW, you can:

  1. Use a diagnostic scanner to clear the fault codes
  2. After fixing the underlying issue, clear the codes again to ensure they do not return

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

← All BMW Diagnostic Trouble Codes

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