crankshaft position sensor error??

Here goes one for the electrical / engine people....

My 1997 LSI runs and performs perfectly. It recently had its timing
belt, waterpump and some pulleys changed. All back together and it
runs like a top.

Problem: The check engine light comes on when you start it and
remains on. It is sending the code for the crankshaft position
sensor. Sensor tested fine, but changed it anyway. No luck. Did
complete troubleshooting of harness etc. per Subaru manual and all
checks ok. The crank pulley looks fine too with all of its teeth in
line where they belong for the sensor.

You can clear the code, start the car with no CEL on, but after you
shut it off, and restart, on pops the light. Using the OBDII tester,
when the ignition is on but not running you can clear the code fine,
and no codes found. A soon as the car is started, up comes the code
on the meter, and the next time the car is started, on comes the
light.

My mechanic gave up. He said that when these crank sensors go bad the
car does not run, and this one runs great!

I am at a loss here. Anyone else experience this and have a remedy or
suggestions?

Another question: The manual refers to two crank sensors, and one cam
sensor, but we can only find on each, the ones in the front center of
the engine under the alternator. Are there one or two cranks sensors?
Any help with its location and answers to above much appreciated!!

Happy Spring!!