by licking stuff
remove dash replace bulb(instrument cluster)
You can view the 1999 Mercury Cougar owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
http://www.wooddashexperts.com/customer/home.php?cat=2130 lot of dash kits for mercury & ford
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
under the dash on the drivers side AND UNDER THE HOOD ON THE DRIVERS SIDE...
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The 2000 Mercury Cougar OBD 2 port is under driver side dash next to kick panel
You're going to have to replace them. Find yourself a good manual that details how to remove your dash, and pray you don't loose anything.
Under the dash on the drivers side of the car.