How many sensors are on the camshaft and is this something that can be repaired by a novice technician. What else does it affect?
Have a code showing P0340 cam shaft position sensor? on 2007 Chrysler Aspen
Theres only one camshaft sensor, depending on where this sensor is you may not be able to do it, not replacing this sensor will leave you stranded once the sensor is really bad once it starts going you get the check engine once it goes you'll need to be tow request a diagram of the sensor location at sinautoscan.com under forum al post up a diagram
sometimes all you need to do is install a firmware upgrade no big deal about $48 bucks at the dealer.