P1155 – HO2S22 Transition Time Fault (Ford)

Description

P1155 Ford indicates the downstream O2 sensor on Bank 2 is switching too slowly.

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Symptoms

  • Hesitation
  • Poor acceleration
  • High fuel consumption

Causes

  • Sensor aging
  • Exhaust leak
  • Contamination

Diagnosis

  • Check O2 switching rate
  • Inspect exhaust
  • Scan fuel trims

Repair

  • Replace O2 sensor
  • Repair exhaust leak