P1151 – HO2S22 Indicates Lean (Ford)

Description

P1151 Ford indicates the downstream O2 sensor on Bank 2 is stuck lean.

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Symptoms

  • Hesitation
  • Poor acceleration
  • High fuel trims

Causes

  • Vacuum leak
  • MAF contamination
  • Weak fuel pressure

Diagnosis

  • Check MAF
  • Inspect vacuum lines
  • Scan O2 data

Repair

  • Clean MAF
  • Repair leaks
  • Replace O2 sensor