* Key: Try all your keys. The most common cause is a problem with the key itself, particularly the chip inside that communicates with the car's computer. If you have a spare key, try that.
* Battery: A weak battery can cause intermittent anti-theft issues. Try jump-starting the car. If it starts, you likely need a new battery.
* PATS System (Passive Anti-Theft System): This is Ford's integrated anti-theft system. If the car's computer doesn't recognize the key's transponder signal, it won't allow the engine to crank.
* Check the Key Fob Battery (if applicable): Some 1997 Taurus models might have key fobs, although this wasn't standard on all trims. A weak battery in the fob could interfere with the signal.
* Key Programming: If you've recently had the car's ignition system or computer work done, it's possible the key wasn't correctly reprogrammed to the vehicle's system. You'll likely need a locksmith or Ford dealer to reprogram the keys.
* Immobilizer light: Check your instrument cluster for an indicator light related to the anti-theft system (often a small key symbol or a padlock symbol). A flashing or illuminated light indicates a problem.
* Other Electrical Issues: Rule out other electrical problems. Check fuses, particularly those related to the ignition system.
What NOT to do: There's no "reset button" or simple sequence to bypass the anti-theft system. Attempting to bypass or disable it yourself could damage the car's computer system and might void your warranty if applicable.
If you've tried the above and your car still won't start:
* Call a Locksmith: A locksmith specializing in automotive security systems can diagnose and potentially resolve PATS issues.
* Tow to a Ford Dealership or Repair Shop: They have the diagnostic tools to determine the exact cause of the problem and the expertise to repair it correctly.
Remember, trying to force the system could cause more harm than good. Professional help is usually the best solution when dealing with car anti-theft problems.
