P1161 BUICK, CADILLAC, CHEVROLET, GMC: HO2S HEATER CONTROL CIRCUIT BANK 2 SENSOR 2
POST UPDATED IN June, 2023
P1161 BUICK, CADILLAC, CHEVROLET, GMC: HO2S HEATER CONTROL CIRCUIT BANK 2 SENSOR 2
HO2S (Oxygen Sensors) are key parts of engine management. Their function is to monitor the oxygen activity in the exhaust and then provide a voltage signal to the PCM (Powertrain Control Module). Once this data is received, the controller adjusts the air/fuel mixture parameters as necessary.
An important factor for HO2S to provide accurate readings is its temperature. It is for this reason that they have a heating element, whose objective is to achieve this operating temperature in the shortest time
The PCM continuously checks the system, including the oxygen sensors, to verify that their performance is adequate. P1161 OBDII fault code indicates that the HO2S heater control circuit number 2 on bank 2 has failed.
The reasons why the P1161 OBD2 diagnostic code is set are:
The steps to follow to correct the DTC P1161 OBDII code are as follows: