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16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean

Possible Causes

  • Mass Air Flow Sensor (G70) defective
  • Intake System Leak(s)

Possible Solutions

  • Check Mass Air Flow Sensor (G70)
  • Check Fuel Pressure Regulation
  • Check Fuel Pump
  • Check Injectors
  • Check Intake System for Leaks
  • Check Exhaust System for Leaks
  • Check Secondary Air System for Leaks
  • Check Vacuum Pipes for Leaks

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