low coolant. usually once it is tripped it will stay on until the ignition is cycled. so if the level is right on the border line it may only trip the light if u r going uphill, or whatever and then will stay on until the car is sut off
The radiator fluid is low or you parked the car at am angle.
i have a 1999 cougar mercury vehicle that all of a sudden doesn't reverse.Why?
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 need an oil change.
You are low on coolant.
it is located on the light a switch that says 12sec on and off
This is the coolant level idiot light, Mercury messed up when they designed this and the light goes on when the coolant is well within tolerance. You can either replace the sensor with a new one from ford that has been redesigned, or you can top off the coolant to just at the Max line, or to just a little above, that should turn the light 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.