Car still down

I took my car in to have it looked at because i couldn't figure out why i wasn't getting any spark because i checked everything that i could think of .. so they tell me its my crank sensor.. well that would be fine an all but i put a brand new 1 in there right before i had it towed up.. so i go and get another 1 and put it in and still no spark? they said that they checked all the grounds and everything is fine the only thing they could find was the crank sensor? so what do i do now? ive only had the damn car for 3 months and allready i have had to replace the engine and the computer now this!!!!!!! plz help if u have any ideas!!!!!!

could my crank be bad? i was driving home from work and went to shift into 2nd and it just died? i was talking to someone and they said it might be my crank.. what do u guys think?

anyone have ne ideas? lol