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P1688 – BMW DTC

BMW DTC P1688 – Electronic Throttle Control Monitor Level 2/3 Mass Air Flow Calculation

DTC P1688 meaning on BMW

DTC P1688 on a BMW refers to the Electronic Throttle Control Monitor Level 2/3 Mass Air Flow Calculation. This diagnostic trouble code indicates an issue with the electronic throttle control system’s monitoring of the mass airflow calculation.

BMW DTC P1688 symptoms

Symptoms of BMW DTC P1688 may include:

  • Reduced engine power
  • Engine stalling
  • Difficulty accelerating
  • Check Engine Light illuminated

BMW DTC P1688 causes

Common causes of BMW DTC P1688 include:

  • Dirty or faulty mass airflow sensor
  • Issues with the electronic throttle control system
  • Vacuum leaks
  • Wiring or connector problems

BMW DTC P1688 seriousness

DTC P1688 on a BMW should be addressed promptly as it can lead to drivability issues and potential engine damage if left unresolved. Ignoring this code may result in unsafe driving conditions and further complications.

How to diagnose DTC P1688 on BMW

To diagnose BMW DTC P1688, a mechanic may perform the following steps:

  1. Scan the vehicle’s computer for fault codes
  2. Inspect the mass airflow sensor for dirt or damage
  3. Check the electronic throttle control system for proper operation
  4. Inspect for vacuum leaks
  5. Test wiring and connectors for continuity

How to fix DTC P1688 on BMW

To fix BMW DTC P1688, the following steps may be taken:

  1. Clean or replace the mass airflow sensor
  2. Repair or replace any faulty components in the electronic throttle control system
  3. Address any vacuum leaks
  4. Repair or replace damaged wiring or connectors

How to erase DTC P1688 on BMW

To erase DTC P1688 on a BMW, a diagnostic scanner can be used to clear the fault code from the vehicle’s computer. After addressing the underlying issue causing the code, the code can be cleared to reset 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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