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.