P1159 – Fuel Trim Multiplicative Bank 2 (Ford)

Description

P1159 Ford indicates the ECU is adjusting multiplicative fuel trim on Bank 2 due to airflow or fuel delivery issues.

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Symptoms

  • Hesitation
  • Poor acceleration
  • High fuel consumption

Causes

  • Vacuum leak
  • Fuel pressure issues
  • MAF contamination

Diagnosis

  • Check fuel trims
  • Inspect MAF
  • Measure fuel pressure

Repair

  • Repair leaks
  • Clean MAF
  • Replace pump