Engine P0340 Error 2006 Gt

For a P0340 code on most cars, your list of likely culprits is:

1. Cam Position Sensor
2. Wiring.
3. PCM

On certain Fords, including yours, you can add the alternator to that list.

I'm not sure how it took your mechanic 5 hours to go through the wiring for the camshaft position sensor circut, there's not but 2 wires in the circuit for each sensor and a total of two sensors.

Get a second opinion from another technician.