You changed your belt 160,000km ago? holy cow!
Is the belt lose, chipped, showing signs of wear?
The belt could be done or the cam sensor is toast.
This is just an opinion, but I would get a new belt put on and then see if you get another code for the cam sensor.
1996 2.5LT V6 Contour ATX
My Tour+help/info pics
E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.