Mercury Sable anti-theft system activates unexpectedly while parked on Mercury Sable

Some Mercury Sable owners report experiencing unexpected activation of the anti-theft system while parked, which can be quite frustrating. This issue may arise due to the SecuriLock anti-theft system requiring special electronically coded keys to start the engine, with the Passive Anti-theft System (PATS) disabling the vehicle if unauthorized access is detected, indicated by a rapidly flashing theft light on the dashboard. Additionally, using the wrong type of coded key can result in a "no-start" condition, underscoring the necessity of using the correct keys. Owners have also reported concerns related to the anti-theft controller, suggesting potential system malfunctions. Furthermore, external factors such as a malfunctioning key fob or environmental conditions may inadvertently trigger the system. If these issues persist, it is advisable to consult with an authorized dealer or a professional mechanic experienced with anti-theft systems for effective diagnosis and resolution.