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Definition of check engine code P1138:
BMW:
O2 Sensor Heater Circuit Low Voltage (Bank 1 Sensor 2)
Chrysler/Dodge/Jeep:
O2 Sensor Heater 2/1 Element Resistance Out of Range
Citroen/Peugeot:
Lack Of HO2S12 Switch - Sensor Indicates Rich
Fiat:
Diesel pressure circuit
Ford:
Lack Of HO2S12 Switch - Sensor Indicates Rich
GM:
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Rich or High Voltage
Jaguar:
Lack Of HO2S12 Switches - Sensor Indicates Rich
Kia:
Lack Of HO2S12 Switches - Sensor Indicates Rich
Land Rover:
Oxygen Sensor Engine Rich *Codes* A D
Lincoln:
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 1
Mazda:
HO2S Bank 1 Sensor 2 Signal Above 0.45v (A/F Ratio Too Rich)
Mercedes:
Lack Of HO2S12 Switches - Sensor Indicates Rich
Mercury:
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 1
Nissan:
Swirl Control Valve
Oldsmobile:
Lack of Downstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 1
Porsche:
Oxygen Sensing
Saab:
Additive Adaptation Bank 2 Min Value Air/Fuel Mixture Too Rich
Saturn:
O2S System Monitor Rich Or High Voltage
Volkswagen/Audi:
Long Term Fuel Trim Add. Fuel,Bank2 System too Lean
Volvo:
Long Term Fuel Trim Add. Fuel,Bank2 System too Lean