Paul And

Hi. My X1 118d recently had a light front end accident. It will not keep running now after the engine starts. It immediately cuts off. I am suspecting the fuel cut off switch. I have found the switch which is behind the rear drivers wheel arch next to the back seat. I already have a diagnostic machine (icarsoft) but I can't reset the fuel cut off via that. Any help/suggestions would be really appreciated. Thanks, Paul