Possible causes – Faulty Front Heated Oxygen Sensor Bank 1 – Intake air leaks – Front Heated Oxygen Sensor Bank 1 harness is open or shorted – Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection – Fuel pressure
Possible causes – Faulty Front Heated Oxygen Sensor Bank 1– Intake air leaks– Front Heated Oxygen Sensor Bank 1 harness is open or shorted– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection– Fuel pressure– Injectors Tech notes If
Possible causes – Faulty Front Heated Oxygen Sensor Bank 1– Intake air leaks– Front Heated Oxygen Sensor Bank 1 harness is open or shorted– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection– Fuel pressure– Injectors Tech notes If
Possible causes – Faulty Mass Air Flow (MAF) Sensor– Vacuum leaks– Throttle system errors Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Mass Air Flow (MAF) Sensor– Vacuum leaks– Throttle system errors Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Oxygen Sensor Bank 1– Oxygen Sensor Bank 1 harness is open or shorted– Oxygen Sensor Bank 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Oxygen Sensor Bank 1– Oxygen Sensor Bank 1 harness is open or shorted– Oxygen Sensor Bank 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Oxygen Sensor Bank 1– Oxygen Sensor Bank 1 harness is open or shorted– Oxygen Sensor Bank 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Oxygen Sensor Bank 1– Oxygen Sensor Bank 1 harness is open or shorted– Oxygen Sensor Bank 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Faulty Pressure Sensor– Pressure Sensor harness is open or shorted– Pressure Sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)
Possible causes – Incorrect fuel pressure– Faulty Fuel Rail Pressure Solenoid– Fuel Rail Pressure Solenoid harness is open or shorted– Fuel Rail Pressure Solenoid circuit poor electrical connection– Air in fuel system When is the code detected? The Engine Control
Possible causes – Incorrect fuel pressure– Faulty Fuel Rail Pressure Solenoid– Fuel Rail Pressure Solenoid harness is open or shorted– Fuel Rail Pressure Solenoid circuit poor electrical connection– Air in fuel system When is the code detected? The Engine Control
Possible causes – Incorrect fuel pressure– Faulty Fuel Rail Pressure Solenoid– Fuel Rail Pressure Solenoid harness is open or shorted– Fuel Rail Pressure Solenoid circuit poor electrical connection– Air in fuel system When is the code detected? The Engine Control
Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1143 Description Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1 is one of the definitions for the P1143; however your vehicle’s manufacturer may have a different definition for