02 Focus 1.8 tddi Crankshaft Sensor Replacement

[auldreekie]

Daughter's 02 Mk1 focus 1.8 TDDI Ghia (Endura Engine) Is a non start. Suspect is the Crankshaft Sensor, I know the battery is healthy, less than a year old, also fuel is reaching all injectors.

I won't be able to get scanner on it until tomorrow to look for errors. Will a dtc code reader pick up a defective crankshaft sensor even though the engine won't start?

If crankshaft sensor needs replacing does it need re-learning or is it plug and pray, install and start engine hopefully?

Thanks