Driving 2008 hyundai it quite while on freeway. towed home still wont start . put a new camshaft sensor .Code reader says PO340, checked ignition - ok, checked fuel , ok any Ideas

Your want to check the connections to it and test if connections are good, otherwise check the VTC (Variable Cam Timing).Look on the net for info on how to test. Check to see if timing belt broke or slipped.

We installed a new cam shaft position sensor and installed a new timing belt. Being very carefull to have all timing marks lined up still wont start

The timing belt did or did not break?