[TraviKnight]

I ran over a curb and hit the bottom left of my car. Now the engine won't start. Took it to a few mechanics they tried to turn it by the crankshaft and it won't budge at all? There is not obvious damage to the underside. What would cause the engine to lock up from something so minor?

[ezaircon4jc]

Originally Posted by TraviKnight

I ran over a curb and hit the bottom left of my car. Now the engine won't start. Took it to a few mechanics they tried to turn it by the crankshaft and it won't budge at all? There is not obvious damage to the underside. What would cause the engine to lock up from something so minor?

Fuel cut-off switch. All injected cars have one which shuts off fuel to the engine in case of a crash. I don't know where it is on the BMW...

Seems to me any competent mechanic would be able to diagnose this; if it is indeed the cut-off switch.

[wcr3d]

The cut off would not prevent the engine from being rolled over.
OP, was the car driven off the curb and/or further?
Not enough information to give a decent guess.