P1211 – Turbocharger Underboost (BMW)

Description

P1211 BMW indicates the turbocharger is producing insufficient boost.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Low power

Causes

  • Boost leak
  • Weak turbo
  • Wastegate stuck open

Diagnosis

  • Check boost pressure
  • Inspect hoses
  • Test turbo

Repair

  • Fix boost leaks
  • Replace turbo
  • Repair wastegate