Category: OBDii Powertrain Codes

P1100 HO2S12 Sensor Circuit Voltage Too Low Air Leak Possible causes – Faulty Mass Air Flow Sensor– Air leak before or after sensor– Mass Air Flow Sensor harness is open or shorted– Mass Air Flow Sensor circuit poor electrical connection What about the obd code? The Engine Control Module (ECM) detected a Mass Air Flow…

P1087 Exhaust Bank 4- Mixture Adaption Range 1 Lower Rich Limit Not Reached 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)

P1088 Exhaust Bank 4- Mixture Adaption Range 2 Lower Rich Limit Not Reached 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)

P1089 Tumble Generator Valve #1 Position Sensor Circuit High Input Possible causes – Faulty Tumble Generator Position Sensor– Tumble Generator Position Sensor harness is open or shorted– Tumble Generator Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1090 Tumble Generator Valve #1 Malfunction Stuck Open Possible causes – Faulty Tumble Generator Position Sensor– Tumble Generator Position Sensor harness is open or shorted– Tumble Generator Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1091 Tumble Generator Valve #1 Malfunction Stuck Closed Possible causes – Faulty Tumble Generator Position Sensor– Tumble Generator Position Sensor harness is open or shorted– Tumble Generator Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1092 Tumble Generator Valve #2 Malfunction Stuck Open Possible causes – Faulty Tumble Generator Position Sensor– Tumble Generator Position Sensor harness is open or shorted– Tumble Generator Position Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1086 Exhaust Bank 4- Mixture Adaption Range 2 Lower Lean Limit Not Reached 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)

P1082 Exhaust Bank 3- Mixture Adaption Range 2 Lower Lean Limit Not Reached 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)

P1083 Exhaust Bank 3- Mixture Adaption Range 1 Lower Rich Limit Not Reached 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)

P1084 Exhaust Bank 3- Mixture Adaption Range 2 Lower Rich Limit Not Reached 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)

P1085 Audi Exhaust Bank 4- Mixture Adaption Range 1 Lower Lean Limit Not Reached 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)

P1085 BMW Fuel Control Mixture Lean Bank 2 Sensor 1 Possible causes – Low fuel pressure– Large vacuum leak on engine– Faulty Mass Air Flow (MAF) sensor– Faulty Ignition– Faulty fuel injector Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1085 Exhaust Bank 4- Mixture Adaption Range 1 Lower Lean Limit Not Reached 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)

P1085 High Pressure Fuel Pump Performance Possible causes – Faulty Fuel Pressure Sensor– Fuel Pressure Sensor harness is open or shorted– Fuel Pressure Sensor circuit poor electrical connection– Fuel system leak– Faulty fuel injector Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1069 A/C Select Circuit Low Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1073 Mass Air Flow Sensor 2 Signal Too Small Possible causes – Faulty Mass Air Flow Sensor– Mass Air Flow Sensor harness is open or shorted– Mass Air Flow Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1074 Mass Air Flow Sensor 2 Signal Too Large Possible causes – Faulty Mass Air Flow Sensor– Mass Air Flow Sensor harness is open or shorted– Mass Air Flow Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1077 Intake Manifold Runner Control Valve Stuck Short Possible causes – Faulty Intake Manifold Runner Control (IMRC) Valve– IMRC Valve harness is open or shorted– IMRC Valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

P1078 Intake Manifold Runner Control Valve Long Stuck Possible causes – Faulty Intake Manifold Runner Control (IMRC) Valve– IMRC Valve harness is open or shorted– IMRC Valve circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)