P1148 INFINITI, NISSAN - CLOSED-LOOP CONTROL FUNCTION BANK 1
POST UPDATED IN June, 2023
P1148 INFINITI, NISSAN - CLOSED-LOOP CONTROL FUNCTION BANK 1
The Air-Fuel Ratio Sensors have some heating elements through which the sensor temperature is achieved as required for proper operation. This heater is controlled by a dedicated circuit. The pulse modulation is used to regulate the temperature of the sensors accurately. The operation of the sensor depends largely on the temperature. With the information provided by the air-fuel ratio sensors, the air and fuel mixture is regulated and adjusted so that it is the closest to the stoichiometric.
DTC code P1148 OBD2 is a manufacturer-specific code. In brands such as Nissan and Infiniti, this code is set when the Powertrain Control Module (PCM) encounters an air-fuel ratio sensor condition, which prevents the module from entering a closed loop.
These are the reasons to set the P1148 OBDII diagnostic code for Nissan and Infiniti:
Steps to solve the fault code P1148 OBD2: