Possible causes For Models before 2005: – Faulty Heated Oxygen Sensor 1 Bank 1 – Heated Oxygen Sensor 1 Bank 1 circuit is open or shorted – Heated Oxygen Sensor 1 Bank 1 circuit electrical connection When is the code
Possible causes – Faulty HO2S21– Fualty Mass Air Flow (MAF) Sensor– HO2S21 harness is open or shorted– HO2S21 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) AUDI Technical Service Bulletins for P1148 code
Possible causes – Faulty HO2S21– Fualty Mass Air Flow (MAF) Sensor– HO2S21 harness is open or shorted– HO2S21 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
Possible causes For Models 2005 and up:– Faulty Air Fuel Ratio Sensor 1 Bank 1 – Air Fuel Ratio Sensor 1 Bank 1 circuit is open or shorted– Air Fuel Ratio Sensor 1 Bank 1 circuit electrical connection For Models
Possible causes For Models 2005 and up:– Faulty Air Fuel Ratio Sensor 1 Bank 1 – Air Fuel Ratio Sensor 1 Bank 1 circuit is open or shorted– Air Fuel Ratio Sensor 1 Bank 1 circuit electrical connection For Models
When is the code detected? 4 Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1148 Description Closed Loop Control Function Bank 1 is one of the definitions for the P1148; however your vehicle’s manufacturer may have a