DTC P1450: Barometric Pressure Sensor Circuit Malfunction Or DTC P1451: Barometric Pressure Sensor Performance Problem: Notes
WARNING: This page is about a different car, the 1999 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Barometric pressure (BARO) sensor is an integral part of a PCM.