How to Program a 1998 Mercury Mystique LS Ignition Transponder Chip Key
Step by Step How to Programming Instructions:
Can I program a new key myself if I have no working keys?
Yes, If the Mystique is a LS model and built before 02-1998. If your Mystique was built after 03-1998 See below.
After you have had a Locksmith cut the transponder key follow these instructions.
1. Insert new key into ignition and turn it to the ON position. ( As far as you can go without cranking engine ) The security light on the dash will flash for fifteen minutes.
2. When the security light stops flashing, turn ignition OFF then back to ON position. The security light will flash for fifteen more minutes.
3. When the security light stops flashing, turn ignition OFF then back to ON position. The security light will flash for fifteen more minutes.
4. After the security light stops flashing the third time turn key to the OFF position. Turn key to the ON position and security light should stop flashing indicating new key has been programmed.
5. Start vehicle to test key.
Can I program a second key myself if I have one working key?
Yes, After you have had a Locksmith cut the transponder key follow these instructions.
1. Insert existing working key in ignition and turn to the ON position then back to the OFF position.
2. Within 5 seconds insert new key in ignition and turn to the ON position. The security light will light up for 2 seconds to indicate successful programming. Turn key to OFF position.
3. Start vehicle to test new key.
Mistiques built after 03-1998 Can I program a new key myself if I have no working keys?
No, here are your options.
1. Preferred Option: Call a mobile Automotive Locksmith to come to your vehicle to originate a new key. The Locksmith will then have to connect a special computer to your vehicle to program the new key.
2. Tow your vehicle to a Dealership and they will originate a new key. The Dealership with then have to connect a special computer to your vehicle to program the new key.
Can I program a second key myself if I have one working key?
No, here are your options.
1. Preferred Option: Call or go to an Automotive Locksmith and they will have to connect a special computer to your vehicle to program the second key.
2. Go to a Dealership and they will have to connect a special computer to your vehicle to program the second key.
Can I program a third key myself if I have two working keys?
Yes, once you have had the new key cut by a Locksmith use the following instructions.
1. Insert an existing working key into the ignition cylinder.
2. Turn the ignition cylinder to ON (RUN) and back to OFF.
3. Remove the existing working key and, within five seconds, insert a second working key and turn it to ON (RUN) then back OFF.
4. Remove second working key and insert the new key before ten seconds have elapsed and turn it to ON (RUN). Leave it on for one second and turn back to OFF.
5. The security light will light up for three seconds to indicate that the new key has been successfully programmed.