yea the bad coolant sensor is almost always the solder joint on the inside of the vic (if your coolant levels are normal). if you take the vic apart there is a pink with black stripe wire, inspect the solder joint for a miniscule crack and repair. As far as the rear lamp failure... Well plainly put... You have a tailight or something similar burnt out. Its usually one of the smaller third brake lights on the top of the hatch. Hope this helps.
Ok so I found out today why the screen is saying rear lamp failure, the tail lights are staying on after the jeep is off and key is out, and the lights are not on. Unhooked the battery and hopeing it resets it, but if not are there any suggestions?
Just to eliminate it as the cause, open the little cubby hole on the floor behind the spare and disconnect the lamp outage module. Then join the two connectors you took off together, bypassing the module.
if that doesnt work, be doubly dang sure you see three lamps in the high brake light.