You need an oil change.
with a socket & wrench
I believe it's either a 40 or 45.
According to the 2001 Mercury Cougar Owner Guide : The wrench light in the overhead warning lights means : ( routine maintenance should be performed , the light comes on after approximately 4800 miles / 358 days )
It means that you need to change your oil.
You need a torx type socket. If you use an Allen wrench...you will strip out the inside of the bolt.
Well, I know that on a 2000 merc cougar, if you press and hold the "Select" and "Units" buttons at the same time, it will reset the light. Hopefully this helps.
I means change the oil or rest the oil % indicator.
If you're talking about that light that looks like a wrench, it involves the trip computer buttons. I believe they were the "units" and "select" buttons and you have to press them for five or ten seconds at the same time.
Press the select button and the unit button at the same time for four seconds. The answer is in your ford manual that came with the car.
on the fuel computer controuls hold the units and select buttons for 5 seconds and it will turn off and you will here a chime