Possible causes – Faulty Electronic Throttle Control System (ETCS) Actuator– Electronic Throttle Control System (ETCS) Actuator harness is open or shorted– Electronic Throttle Control System (ETCS) Actuator circuit poor electrical connection When is the code detected? The P1129 code is
Possible causes – Faulty Electronic Throttle Control System (ETCS) Actuator– Electronic Throttle Control System (ETCS) Actuator harness is open or shorted– Electronic Throttle Control System (ETCS) Actuator circuit poor electrical connection When is the code detected? The P1129 code is
Possible causes – Faulty Manifold Absolute Pressure Sensor– Manifold Absolute Pressure Sensor harness is open or shorted– Manifold Absolute Pressure Sensor circuit poor electrical connection Tech notes There is a factory service bulletin for the following Honda models: 2001 Honda
Possible causes – Faulty Manifold Absolute Pressure Sensor– Manifold Absolute Pressure Sensor harness is open or shorted– Manifold Absolute Pressure Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Engine hard to start–
Possible causes – Faulty Mass Air Flow (MAF) sensor– High fuel pressure– Canister purge solenoid stuck open– Faulty HO2S bank 1 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Mass Air Flow (MAF) sensor– High fuel pressure– Canister purge solenoid stuck open– Faulty HO2S bank 1 Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Fuel delivery system– Engine Coolant Temperature (ECT) sensor or wiring connectors– MAP sensor or wiring connectors– O2 sensor wiring or connectors– Engine mechanical system Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1129 JEEP
Possible causes – Fuel delivery system– Engine Coolant Temperature (ECT) sensor or wiring connectors– MAP sensor or wiring connectors– O2 sensor wiring or connectors– Engine mechanical system Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1129 DODGE
Possible causes – Fuel delivery system– Engine Coolant Temperature (ECT) sensor or wiring connectors– MAP sensor or wiring connectors– O2 sensor wiring or connectors– Engine mechanical system Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1129 CHRYSLER
Possible causes – Fuel delivery system– Engine Coolant Temperature (ECT) sensor or wiring connectors– MAP sensor or wiring connectors– O2 sensor wiring or connectors– Engine mechanical system Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1129 MITSUBISHI
Possible causes Crossed HO2S harness connectors (downstream)Crossed HO2S wiring at the harness connectors (downstream)Crossed HO2S wiring at the 104-pin harness connectors (downstream) Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1129 FORD Description The heated oxygen sensor
Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1129 Description Downstream Oxygen Sensors Swapped from Bank to Bank is one of the definitions for the P1129; however your vehicle’s manufacturer may have a different definition for the