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You need an oil change.
I was looking at the 1999 Mercury Cougar Owner Guide and it does not show that it has a gas cap warning light
On a 2000 Mercury Cougar : That's your Anti-theft system status light
You have to pull the gauge assy out and the lights are mounted from the rear. Run1
disconnect the negative battery cable for 60 seconds then re-connect should do it
You are low on coolant.
hold the select and the units buttons at the same time for 5 to 10 seconds
it is located on the light a switch that says 12sec on and off
Blown fuse
its below freezing temperature
I have a instrument light that is on ---- 1999 Cougar , it looks light a transmission, but I think it is the emission indicator on the far left of the steering wheel, what does this mean?
Check and fix the engine.