Hi I have a c200 on a y plate, had for two year and never a fault, now I can't start it and I'm confused as what's up, many posts point to poss battery some ecu and some gear selector. Car has full dash lights on and releases staring lock, but that's it, no click and no start . Also ( didn't notice at first) now stuck I. P can manually release using mech release, does this point to the gear selector unit? And if so can I get a s/h one??