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P1387 – BMW DTC

BMW DTC P1387 – Ionic Current Signal Low (Bank 1)

DTC P1387 meaning on BMW

The DTC P1387 for BMW refers to the Ionic Current Signal Low detected in Bank 1. This diagnostic trouble code indicates that the engine control module (ECM) has detected a low signal from the ionic current sensor in Bank 1 of the vehicle.

BMW DTC P1387 symptoms

Symptoms of BMW DTC P1387 may include:

  • Check Engine Light (MIL) illuminated
  • Engine running rough
  • Reduced engine performance
  • Possible misfires

BMW DTC P1387 causes

Common causes of BMW DTC P1387 include:

  • Faulty ionic current sensor
  • Wiring or connection issues related to the sensor
  • ECM software or hardware issues

BMW DTC P1387 seriousness

While BMW DTC P1387 may not always result in immediate drivability issues, it is important to address this code promptly to prevent potential engine performance problems and further damage.

How to diagnose DTC P1387 on BMW

To diagnose BMW DTC P1387, a mechanic may perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault code and related data
  2. Inspect the wiring and connections to the ionic current sensor
  3. Test the ionic current sensor for proper operation
  4. Check for any ECM software updates or issues

How to fix DTC P1387 on BMW

To fix BMW DTC P1387, the following steps may be taken:

  1. Replace the faulty ionic current sensor
  2. Repair any wiring or connection issues related to the sensor
  3. Update the ECM software if necessary

How to erase DTC P1387 on BMW

To erase BMW DTC P1387, the fault code can be cleared using a diagnostic scanner that has the capability to reset codes. Once the underlying issue has been addressed and fixed, the code can be cleared to turn off the Check Engine Light.

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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