The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. The oxygen sensor must be at a certain temperature in order for this information to be accurate. The oxygen sensor has a heater wire inside to help bring the sensor up to temperature quicker. When the PCM detects the heater wire is not operating, it will set P0054. The controller area network (CAN) allows the PCM to receive data from the O2 sensor. Data regarding the percentage of oxygen particles in the engine exhaust, as compared to the oxygen content of ambient air, is provided to the PCM by the O2 sensor. The PCM uses this data to calculate fuel delivery and ignition timing.
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