P1135 – O2 Sensor Heater Fault (BMW)

Description

P1135 BMW indicates a fault in the O2 sensor heater circuit.

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Symptoms

  • Rough idle
  • Hesitation
  • Poor cold start

Causes

  • Heater failure
  • Blown fuse
  • Wiring issue

Diagnosis

  • Check heater resistance
  • Inspect wiring
  • Test fuse

Repair

  • Replace O2 sensor
  • Repair wiring
  • Replace fuse

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