1996 Mercury Sable Owner's Manual - Page 167

Coded Key Anti-Theft System If your vehicle is equipped with the coded key anti-theft system, you can only use an electronically coded key to start the vehicle. During each vehicle start, the coded key is "read" by the anti-theft system. If the key's ID code matches that in the anti-theft system, the vehicle is enabled to start. If the key's ID code does not match the anti-theft system, or if no coded key is detected, then the vehicle is not able to start. Your vehicle will need to be taken to the dealership for re-initializaiton if either of the following situations occur: u Both supplied keys are lost or stolen. u Only one key has been lost, but you want to ensure the "lost" key will not start the vehicle. In this case, bring the remaining key(s) to the dealer for re-programming. THEFT indicator The anti-theft indicator (THEFT) in the instrument cluster will light for 2 seconds and then go out when the ignition is turned to the ON or START position. If it does not light or if it flashes, have the system serviced by your dealer or a qualified technician. Programming additional keys Two electronically coded keys were supplied with your vehicle. Additional keys can be purchased as spares, up to a total of 16 keys. To program a new key, use a coded key and the following procedure: 1. 2. With the coded key in the ignition, turn the ignition from the ON to the OFF position. Within 15 seconds, insert the new electronic key in the ignition and turn it to ON or START. The key must have the correct mechanical cut. 140