P1157 – Fuel Trim Additive Bank 2 (Ford)

Description

P1157 Ford indicates the ECU is adding excessive fuel to compensate for a lean condition on Bank 2.

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Symptoms

  • Hesitation
  • Poor acceleration
  • High fuel trims

Causes

  • Vacuum leak
  • MAF contamination
  • Weak fuel pressure

Diagnosis

  • Check fuel trims
  • Smoke test intake
  • Inspect MAF

Repair

  • Repair leaks
  • Clean MAF
  • Replace pump