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Most coolant temp sensors located on thermostat housing- usually at end of upper radiator hose.
I don't think problem is with your purge valve at all. Maybe hose that goes from filler neck down to fuel tank has a kink in it. Are you getting a check engine light? If you do have a purge valve problem you'd be getting a code pointing you in that direction.
Sounds like bad alternator.
I agree with ace. If light comes back on get a new cap.
Call your Volkswagen dealer but I recently had updates to both my PCM and TCM on my 2006 Ford Fusion and cost me $118. I'd have them check to see if updates to both- probably won't change price.
The mass air flow sensor has nothing to do with the cruise control. They could've possibly left a vacuum hose off when replacing sensor or if they did any type of software update on pcm or tcm problem could lie there.
Should be located right near oil filter.
The book probably correct. I don't know why but flashers usually hard to find on most vehicles. You may want to replace your turn signal bulbs front and back to be safe first if you can't find. You would have to have one bulb out on each side of truck though for all turn signals to go out.
You probably don't have a fuse for oil sensor. May be actually telling you that you have an oil pressure problem- which could be oil pump. Does it have an oil pressure guage? If you ever have a tapping noise in motor be concerned. Maybe oil pump screen plugged up too.
May simply be fuel cap. Replace then clear code or disconnect negative battery cable for ten minutes. Generally if light comes back up within 40-50 miles that should be it. If you see cracks around gasket for fuel cap almost for sure that's the problem unless cap left loose. If code comes back up start with finding the evap service port in engine compartment (small green cap on black plastic hose that comes from fuel tank) and inspect all hoses there. Cracked one or anything disconnected that's probably it. If you don't see one you may have to follow hose from tank up. If nothing found may want to replace purge valve which generally located near that cap (fairly small little motor that has at least 2 hoses- one from tank and one to your intake). If not that could be fuel tank pressure sensor. Let's hope just the fuel cap!