I just ordered a new keyless remote for my 98 Ford Explorer. When I activate this, does it deactivate the old one, since I lost it? And does anybody have the Programming Instructions for it, or is it usually the basic, turn ignition on, press lock and repeat the steps 4 or 5 times until it locks the doors?

 

Once the car is programmed to recognize your new remote, the old one will not work.

Doors close, turn key to on and off(don't start engine) rapidly 5 or 8 times(forgot which), ending in the on position. When the chime sounds and all the doors lock and unlock, push any button on the remote and it should be programmed.

 

If you lost only one of your remotes, you'll also need to reprogram your remaining remote along with your new one. After you've gone through the on/off switch sequence to enter the programming mode, you just press a button on the remote you wish to program... The door locks will cycle to acknowledge success for that remote. You then press a button on the next remote, and you should get another lock cycle. You need press only one button on each remote.

All of the remotes you program during a single programming session will now work with your vehicle, and the programming erases any previous remote controls from memory.