Actually when you pull the harmonic balancer on our year you will need to remove a piece from oil system , can't remember if it is what the oil filter sits on ( had my mechanic do it and only glanced at it while I stopped by) so you would need a new gasket to re-assemble it, ( pretty cheap little gasket).
It is very possible that it is the cranks sensor. The belt could have easily hit the wires and pulled them off or damaged them. When my crank sensor was bad it would not start. I also had the belt hit my cam sensor, so the belt does run close enough to wires in the first place, so to have one let go, it could have hit a few different wires.
Also when I had my crank sensor changed he was able to take the old one off and new one on without removing the harmonic balancer.
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