Condition (DTC P1451)
WARNING: This page is about a different car, the 2002 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
DTC P1451 is set when barometric pressure calculated using Manifold Absolute Pressure (MAP) sensor does not match barometric pressure sensor output voltage during engine deceleration. MIL is illuminated when ECM detects malfunction during 2 consecutive drive cycles.