987 · Fuel

P2191

System Too Lean at Higher Load (Bank 1)

MED SEVERITY

Bank 1 fuel mixture is too lean under higher load.

SYMPTOMS

  • Check-engine light
  • Hesitation
  • Power loss under load

LIKELY CAUSES

  • Low fuel pressure/volume
  • Weak fuel pump
  • Dirty MAF
  • Intake leak

DIAGNOSIS STEPS

  • Read fuel trims under load
  • Check fuel pressure under load
  • Inspect MAF and intake

RELATED PARTS

  • Fuel pump
  • MAF sensor
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