P1139 OBD Code Definition:
P1139 Water In Fuel Indicator Circuit Malfunction
P1139 OBD Code Description:

Possible Symptoms

• Malfunction Indicator Light (MIL) active
• Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

• Mass Air Flow (MAF) Sensor faulty
• Fuel Pressure Regulator faulty
• Fuel Injector(s) faulty
• Oxygen Sensor Control faulty
  • Oxygen Sensor(s) faulty
• Evaporative Emission (EVAP) System faulty

Possible Solutions

• Check Mass Air Flow (MAF) Sensor
• Check Fuel Pressure Regulator
• Check Fuel Injector(s)
• Check Oxygen Sensor Control
  • Check Oxygen Sensor(s)
• Check Evaporative Emission (EVAP) System