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2021 BMW X3 XDRIVE30I
2.0L I4 Turbo B48•AWD•AUTOMATIC•gas•B48B20•turbo
11 active safety recalls on this vehicle — view recalls
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Repairs0Labor488Torque3403Fluid10DTC2243Battery1Maintenance0Recalls11
P0321high severityPowertrain

Ignition/Distributor Engine Speed Input Circuit Range/Performance

on 2021 BMW X3 xDrive30i 2.0L I4 Turbo B48 · AWD

What this code means

The engine speed signal from the ignition or distributor sensor is present but out of expected range. This often means erratic or intermittent RPM readings that confuse the PCM.

Symptoms

  • Erratic tachometer readings
  • Hard starting or stalling
  • Intermittent misfire feel

Common causes

  • Faulty crankshaft/RPM sensor
  • Damaged sensor wiring or connector
  • Reluctor ring damage
  • Faulty ignition module

Diagnostic steps

  1. Scan for related codes and freeze frame
  2. Inspect sensor wiring and connectors
  3. Check sensor signal with scope during crank
  4. Test reluctor ring and sensor air gap
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