P1136 – O2 Sensor Circuit Low (BMW)

Description

P1136 BMW indicates the O2 sensor signal is lower than expected.

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Symptoms

  • Rough idle
  • Hesitation
  • High fuel trims

Causes

  • Sensor failure
  • Air leak
  • Wiring issue

Diagnosis

  • Check O2 voltage
  • Inspect intake
  • Check wiring

Repair

  • Replace sensor
  • Fix intake leaks
  • Repair wiring