Long story short took the misses too hospital the day comes out car woundnt start, rings breakdown they tell me they dont no what it is

( all he done was pop the bonnet and just look at it)
Its currently in the garage but they cant even get it started, its been scanned threw up a few codes which was on it before it wouldnt start, no new ones, changed oil sensor as that was 1 of the codes, the other 2 codes were speed sensor and camshaft position sensor, would any of these stop it starting or is it something else thanks in advance for any help