Right my car has started to be really difficult to start.

First of all ithought the battery didn't have enough juice but its not that as i got the jump leads out and hooked it up to a brand spanking new car.

Fuel pump is priming so i know theres power going there.

The starter motor is fairly new and seems to be working when i turn the key.

Is it possible it could be the crank sensor? whats the syptoms of that failing?