P1186 BMW, MINI: O2 SENSOR HEATER CONTROL CIRCUIT BANK 1 SENSOR 2
POST UPDATED IN May, 2023
P1186 BMW, MINI: O2 SENSOR HEATER CONTROL CIRCUIT BANK 1 SENSOR 2
An HO2S (Oxygen Sensor) is an essential component of the combustion system. Its function is to measure the amount of oxygen in the exhaust. Then, this sensor provides this data to the Powertrain Control Module (PCM). The PCM uses the information received by the PCM to adjust the air-fuel mixture as required to ensure optimum engine performance.
The oxygen sensor’s accurate readings are highly dependent on its temperature. For this reason, a heating element is incorporated into these sensors, which significantly reduces the time it takes for the sensor to reach this temperature.
The PCM continuously checks the performance of the oxygen sensor to verify if the oxygen sensor parameters are within the appropriate levels. If a malfunction is detected in the circuit controlling the heater of the O2 Sensor number 2 of bank 1, the diagnostic code P1186 OBDII will be set.
Reasons to set the P1186 OBD2 fault code:
To troubleshoot the DTC P1186 OBDII, try this: