Info on this at alldatadiy.com says:
If the signal from the atmospheric pressure sensor is faulty or missing the engine control module (ECM) adopts a substitute value.
There was no part number or price listed for the sensor.
Timing belt change is 70K miles. Serpentine belt change is at 60K
miles. The 60K service is a big one (similar to 30K) and the 70K
is oil and the timing belt. Note that 98 vehicles with an engine number
higher or equal to 1266128- have a mechanical tensioner belt (a newer
design) and that one might last longer then 70K, I'm not sure (it is also
supposed to be harder to change). The 1266128- engine number is
from TSB 2210015 which describes the procedure to adjust the timing
belt tension.
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