Actually it is very unlikely that either condition will set a code. crank sensors almost never set a code. The only way they set a code is if they run intermittantly for a period. They usually just won't let the car start and because the controller doesn't see the engine turning it doesn't fault them.

It is easy to monitor the fuel pressure so if it isn't that then it is the other. BUT!! if the crank sensor doesn't show rpm the controller shuts off the pump so the test is useless for a no start. In that case you bypass the pump relay and verify pressure.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician