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2000 BMW X5 4.4I E53
4.4L V8 M62•AWD•AUTOMATIC•gas•M62B44
6 active safety recalls on this vehicle — view recalls
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Repairs0Labor489Torque2160Fluid10DTC1997Battery1Maintenance0Recalls6
P0389moderate severityPowertrain

Auxiliary/Secondary Knock Sensor 2 Circuit Intermittent

on 2000 BMW X5 4.4i E53 4.4L V8 M62 · AWD

What this code means

The PCM sees an intermittent or erratic signal from the second knock sensor circuit. The problem may come and go with vibration or temperature changes.

Symptoms

  • Intermittent check engine light
  • Occasional power loss
  • Random engine pinging

Common causes

  • Loose or corroded connector
  • Chafed sensor wiring
  • Faulty knock sensor 2
  • Loose sensor mounting

Diagnostic steps

  1. Retrieve stored and pending codes
  2. Wiggle-test sensor wiring while monitoring
  3. Inspect sensor torque and mounting surface
  4. Repair harness or replace sensor as needed
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