Possible causes – Warm Up Three Way Catalytic converter deterioration or malfunction– Exhaust system leaks– Loose front or rear HO2Ss– Faulty front heater O2 sensor– O2 sensors harness is open or shorted– O2 sensors poor electrical connection Tech notes As

Possible causes – Warm Up Three Way Catalytic converter deterioration or malfunction– Exhaust system leaks– Loose front or rear HO2Ss– Faulty front heater O2 sensor– O2 sensors harness is open or shorted– O2 sensors poor electrical connection Tech notes As

Possible causes – Warm Up Three Way Catalytic converter deterioration or malfunction– Exhaust system leaks– Loose front or rear HO2Ss– Faulty front heater O2 sensor– O2 sensors harness is open or shorted– O2 sensors poor electrical connection Tech notes As

Possible causes – Warm Up Three Way Catalytic converter deterioration or malfunction– Exhaust system leaks– Loose front or rear HO2Ss– Faulty front heater O2 sensor– O2 sensors harness is open or shorted– O2 sensors poor electrical connection Tech notes As

Possible causes – Weak battery- Low voltage while cranking– Faulty Engine Control Module (ECM) relay– Blown ECM fuse– Faulty ECM– ECM harness is open or shorted– ECM circuit poor electrical connection Tech notes Check all the ECM fuses, if the

Possible causes – Weak battery- Low voltage while cranking– Faulty Engine Control Module (ECM) relay– Blown ECM fuse– Faulty ECM– ECM harness is open or shorted– ECM circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon

Possible causes – Weak battery- Low voltage while cranking– Faulty Engine Control Module (ECM) relay– Blown ECM fuse– Faulty ECM– ECM harness is open or shorted– ECM circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon

Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Engine Misfire– Engine Run Rough

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

Possible causes – Air Injection Pump Relay harness is open or shorted– Air Injection Pump Relay circuit poor electrical connection– Faulty Air Injection Pump Relay Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Check air duct intake for damage– Check engine for vacuum leaks– Faulty Mass Air Flow (MAF) Sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

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

Possible causes – Engine Control Module (ECM) Program– Intake manifold runner control mechanical problems– Intake manifold runner control actuator malfunction– Intake manifold runner control open or short circuit– Intake manifold runner control poor electrical condition Tech notes There is a

Possible causes – Engine Control Module (ECM) Program– Intake manifold runner control mechanical problems– Intake manifold runner control actuator malfunction– Intake manifold runner control open or short circuit– Intake manifold runner control poor electrical condition Tech notes There is a

Possible causes – Engine mechnical condition– Fuel system malfunction– Ignition system malfunction– Faulty oxygen sensor Symptoms – Engine Light ON (or Service Engine Soon Warning Light) AUDI Technical Service Bulletins for P1093 code 2005 AUDI A4 FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP

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

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

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

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

Possible causes – Faulty Closed Throttle Position Switch– Closed Throttle Position Switch harness is open or shorted– Closed Throttle Position Switch circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)