P1133 – Mixture Control Fast Response (BMW)

Description

P1133 BMW indicates excessively fast mixture control response.

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Symptoms

  • Rough idle
  • Hesitation
  • Surging

Causes

  • Sensor fault
  • Air leak
  • Fuel pressure issue

Diagnosis

  • Check fuel trims
  • Inspect intake
  • Test fuel pressure

Repair

  • Replace sensor
  • Fix intake leaks
  • Repair fuel system