– 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 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
2004-2005 Infiniti FX35
2004-2005 Infiniti FX45
2004-2005 Infiniti G35 Sedan
2004-2005 Infiniti G35 Sedan
Infiniti Factory Service Bulletin OBDII Code P1148
The bulletin suggest reprogramming the Engine Control Module (ECM) first before replacing any parts.
The Engine Control Module (ECM) performs ON/OFF duty control of the Air Fuel Ratio (A/F)/Heated Oxygen Sensor 1 heater corresponding to the engine operating condition to keep the temperature of Air Fuel Ratio (A/F)/Heated Oxygen Sensor 1 element at the specified range.