EGR Control Pressure/BARO Sensor

On vehicles equipped with EGR, the EGR control pressure sensor, mounted on the left side of the cowl, is used to monitor the amount of vacuum applied to the EGR valve. It senses the actual vacuum in the EGR vacuum line and sends a signal back to the PCM. The signal is compared to the desired EGR calculated by the PCM. On vehicles not equipped with EGR, the boost sensor is used to measure BARO. This sensor reads barometric pressure (BARO) under certain conditions, which allows the PCM to automatically adjust for different altitudes.