If the CTS is gone bad - yes, it's a large fix.... believe it or not.
I got a CEL this morning (2003 W8) and the reading comes back with:
17699 - Coolant Temp Sensor at Radiator Outlet (G83): Signal too Large
P1291 - 35-10 - - - Intermittent
18068 - Coolant Fan Control 1: Short to Ground
P1660 - 35-10 - - - Intermittent
16840 - EVAP System: Very Small Leak Detected
P0456 - 35-00 - -
Anyone seen these codes before and if so, is it a major issue to be concerned with, or a minor fix?