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2021 BMW I3
Range Extender•RWD•AUTOMATIC•hybrid
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Repairs0Labor318Torque3717Fluid6DTC2228Battery1Maintenance0Recalls0
CC-ID-278moderate severityPowertrain

Engine Speed Too Low

on 2021 BMW i3 Range Extender · RWD

What this code means

The engine RPM has dropped below the safe idle threshold, risking a stall. This is raised by the engine control (DME) system monitoring idle speed.

Symptoms

  • Rough or unstable idle
  • Engine feels like it may stall
  • Warning message in cluster

Common causes

  • Faulty idle air control or throttle body
  • Vacuum leak in intake
  • Dirty or failing mass air flow sensor
  • Weak battery or charging issue

Diagnostic steps

  1. Read fault codes with diagnostic scanner
  2. Inspect throttle body and clean if needed
  3. Check for intake vacuum leaks
  4. Test battery and charging system
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