Cruise control on a 1999 Ford Taurus does not engage. Any estimate on how much it would cost to fix?

You answered it urself Jewel! Is it worth it? They dont have good resale to begin with. So only if u plan on drivin it the next 5 yrs it has left and cant live w/o, then maybe its worth it. The fact that this light comes on and off suggests its not somethin simple like a fuse so now we go straight to $100,s likely. I can find ur exact car fer $500, and probably less kms so inquire maybe, but dont spend girl!

Well it could be anything from a bad switch to a bad module or maybe even an electrical problem. Not much detail in your question. If anything find a place that can do a diagnostics for cheap and then you'll know for sure how much it will cost ask around with friends and family for a trusted repair shop, a lot of shops like to just throw parts at cars and hope it fixes the problem. But in my opinion I would not spend too much money on the fancy stuff for a 99 Taurus. As long as it gets from A to B that's all you need.