At that low a mileage, you have to wonder if the timing belt has ever been replaced. People don't realize that there is an age (time) factor on them too (7 years for 2nd gens, probably same or similar for 1st gens), and that has been found to be real - some people have learned that the hard way (on 2nd gens, you get valve damage when it breaks).
I don't know 1st gens, but on 2nd gens, you can remove a few bolts at the top of the timing cover and lightly pry (not enough to permanently bend) to open a small gap to peak in and see if the belt and cam sprocket move when someone cranks the engine.
My guess is that is the problem (again, due to the age and very low miles and probably original belt). Then - yes - engine sensors are the next suspects.
'98 LXi - Later Concorde gages (black w/ chrome rings)/'99 LX - LHS gages (white) - HIR bulbs