P1209 – Charge Pressure Plausibility (BMW)

Description

P1209 BMW indicates the charge pressure reading is not plausible.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Low boost

Causes

  • Boost leak
  • Sensor mismatch
  • Turbo wear

Diagnosis

  • Compare boost readings
  • Inspect hoses
  • Test turbo

Repair

  • Fix boost leaks
  • Replace sensor
  • Repair turbo

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