A powered fastener driver including: a housing; a nosepiece extending from the housing; a driver blade movable within the nosepiece; a piston coupled to the driver blade for movement therewith; a driver cylinder within which the piston is movable from a top dead center position (TDC) and a bottom dead center (BDC) position; a magazine coupled to the nosepiece in which collated fasteners are receivable; a fastener delivery mechanism coupled to the nosepiece for individually transferring collated fasteners in the magazine to a fastener driving channel in the nosepiece, the fastener delivery mechanism movable between a fastener retrieval position and a fastener delivered position in which a fastener of the collated fasteners is properly loaded into the fastener driving channel; and a sensor for determining when a position of the fastener delivery mechanism is in the fastener delivered position.