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Buick Workshop Service and Repair Manuals

Coolant Temperature Sensor/Switch (For Computer) > < Barometric Pressure Sensor|Description and Operation
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Barometric Pressure Sensor: Service and Repair

MAP and Vacuum sensors are accessible through the engine compartment. 

The BARO sensor may be located either in the engine compartment or strapped to the ECM harness under the dash panel.

Check for loose hoses and electrical connections, 

If a sensor tests as faulty replace sensor

Coolant Temperature Sensor/Switch (For Computer) > < Barometric Pressure Sensor|Description and Operation