Possible causes – Faulty Oxygen Sensor– Oxygen Sensor harness is open or shorted– Oxygen Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Oxygen Sensor– Oxygen Sensor harness is open or shorted– Oxygen Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Oxygen Sensor– Oxygen Sensor harness is open or shorted– Oxygen Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty Throttle Actuator Control (TAC) module– Throttle Actuator Control (TAC) module harness is open or shorted– Throttle Actuator Control (TAC) module circuit poor electrical connection (loose or broken wires) Symptoms – Engine Light ON (or Service Engine

Possible causes – Faulty Vacuum Switching Valve (VSV)– Vacuum Switching Valve (VSV) harness is open or shorted– Vacuum Switching Valve (VSV) circuit poor electrical connection– Faulty Pressure Sensor– Faulty Air Switching Valve When is the code detected? If the Engine

Possible causes – Fuel metering solenoid harness is open or shorted – Fuel metering solenoid electrical circuit poor connection – Faulty fuel metering solenoid Symptoms – Engine Light ON (or Service Engine Soon Warning 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 – 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 – Low coolant level– Faulty Engine Coolant Temperature Sensor– Stuck or leaking thermostat– Engine Coolant Temperature Sensor harness is open or shorted– Engine Coolant Temperature Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine

Possible causes – Low fuel pressure– Engine misfire– Large vacuum leak– Blocked converter– Faulty O2 sensor bank 2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Low fuel pressure– Misfire condition– Large vacuum leak– Air leak near sensor– Plugged catalytic converter– Lean air/fuel ratio– Faulty front O2 sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2096 AUDI Description The

Possible causes – Open or short circuit condition– Faulty Throttle Position Sensor (TPS)– Faulty Throttle Drive electric motor– Faulty Throttle Valve Control Module Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Timing belt installation– Faulty Camshaft Adjustment Valve 1– Camshaft Adjustment Valve 1 harness is open or shorted– Camshaft Adjustment Valve 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Timing belt installation– Faulty Camshaft Adjustment Valve 1– Camshaft Adjustment Valve 1 harness is open or shorted– Camshaft Adjustment Valve 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Timing belt installation– Faulty Camshaft Adjustment Valve 1– Camshaft Adjustment Valve 1 harness is open or shorted– Camshaft Adjustment Valve 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Timing belt installation– Faulty Camshaft Adjustment Valve 1– Camshaft Adjustment Valve 1 harness is open or shorted– Camshaft Adjustment Valve 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Tech notes There is a factory service bulletin for the P3138 code for the following models: 2005-2007 Audi A32005-2007 Audi A42007 Audi A4 Cabriolet2008 Audi TTAudi Factory Service Bulletin OBDII Code P3138 Symptoms – Engine Light ON (or Service Engine

Tech notes There is a factory service bulletin for the P3137 code for the following models: 2005-2007 Audi A32005-2007 Audi A42007 Audi A4 Cabriolet2008 Audi TTAudi Factory Service Bulletin OBDII Code P3137 Symptoms – Engine Light ON (or Service Engine

Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1698 AUDI Description Check Detected Trouble Code (DTC) in Memory Of Steering Column Electronic Control Unit (ECU)

Symptoms – Engine Light ON (or Service Engine Soon Warning Light)