Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection When is the code detected? The test fails if the Powertrain Control
Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Rear O2 Sensor– Rear O2 Sensor harness is open or shorted– Rear O2 Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Swirl Control Valve Control Position Sensor– Swirl Control Valve Control Position Sensor harness is open or shorted– Swirl Control Valve Control Position Sensor circuit poor electrical connection– Faulty Swirl Control Valve When is the code detected?
Possible causes – Faulty Swirl Control Valve Control Position Sensor– Swirl Control Valve Control Position Sensor harness is open or shorted– Swirl Control Valve Control Position Sensor circuit poor electrical connection– Faulty Swirl Control Valve When is the code detected?
Possible causes – Intake air leak– Faulty O2 Sensor– Faulty Mass Air Flow (MAF) Sensor– O2 Sensor harness is open or shorted– O2 Sensor circuit poor electrical connection Tech notes 2002 Volkswagen Passat User Submitted Video Symptoms – Engine Light
Possible causes – Intake air leak– Faulty O2 Sensor– Faulty Mass Air Flow (MAF) Sensor– O2 Sensor harness is open or shorted– O2 Sensor circuit poor electrical connection Tech notes 2002 Volkswagen Passat User Submitted Video Symptoms – Engine Light
Possible causes – Leaking injector or regulator– Engine ignition misfire– Engine mechanical condition– Faulty HO2S– HO2S Sensor 2 harness is open or shorted– HO2S Sensor 2 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning
Possible causes – Vacuum leak on engine– Faulty Failed Mass Air Flow (MAF)– Faulty HO2S– HO2S harness is open or shorted– HO2S circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1138 Description Lack Of HO2S12 Switch – Sensor Indicates Rich is one of the definitions for the P1138; however your vehicle’s manufacturer may have a different definition for the