P1159 OBD Code Definition:
P1159 Fuel Stepper Motor Malfunction
P1159 OBD Code Description:

Possible Symptoms

  • Power Loss

Possible Causes

  • Air Intake dirty
  • Mass Air Flow Sensor defective
  • Mass Air Flow Sensor 2 defective

Possible Solutions

  • Clean Air Intake
  • Check Mass Air Flow Sensor
  • Check Mass Air Flow Sensor 2
  • Check Exhaust Gas Recirculation
  • Check Boost Pressure Control

Tech Notes

  • Log MAF vs. MAF 2 readings on a test drive and compare the result.


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