he cleared the codes??
you need to know what he cleared..
his machine plugs into your car so he can get the trouble code from your car.. (the car tells him what went wrong)
if all he did was reset this data.. then he has done you no good what so ever.
contact him and ask him what the car told him before he cleared this vital piece of infomation... if he says there was none.. then remind him in that case he had nothing to clear..
on a side note... Crank sensors seem to be common on renault diesels..