How to reset anti theft on a 2005 ford five hundred

Light flashing. Some locksmiths can reprogram them. Call around.

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It simply means that its time for routing service and maintenance on your car. This will normally be reset when you take it in for an oil change. 1. Ford has issued a Special Service Message (SSM), stating that the owner's manual procedure is incorrect, and giving a revised procedure. The following is the text of the SSM:

18562 2005 FREESTYLE/FIVE HUNDRED/MONTEGO - OIL LIFE RESET PROCEDURE
THE 2005 FREESTYLE, FIVE HUNDRED, AND MONTEGO VEHICLE OWNER'S GUIDE OIL LIFE RESET PROCEDURE IS INCORRECT. TO RESET OIL LIFE ON VEHICLES WITHOUT MESSAGE CENTER, USE THE TRIP/RESET BUTTON TO TOGGLE THE ODOMETER DISPLAY TO 'OIL LIFE XX%'. THEN PRESS AND HOLD THE BUTTON FOR 10 SECONDS TO RESET TO 100%. THE INSTRUMENT CLUSTER WILL BEEP WHEN THE OIL LIFE IS RESET.
FOR VEHICLES WITH A MESSAGE CENTER, PRESS 'SETUP' TO DISPLAY 'PRESS RESET FOR SYS CHECK'. PRESS AND RELEASE 'RESET' TO START SYSTEM CHECK. WHILE 'OIL LIFE XX%' IS DISPLAYED, PRESS AND HOLD 'RESET' UNTIL 'IF NEW OIL HOLD RESET' IS DISPLAYED, THEN RELEASE. PRESS AND HOLD 'RESET' AGAIN UNTIL 'OIL LIFE SET TO 100%' IS DISPLAYED. THE INSTRUMENT CLUSTER WILL BEEP WHEN THE OIL LIFE IS RESET.
EFFECTIVE DATE: 04/20/2005

Ford PATS doesn't have a reset like GM. First try a different key and disconnect all electronic devices in the car like phone charger, GPS, dash cam, etc. If that doesn't work, you'll have to get the trouble codes read

Sometimes jus using your keypad unlock and lock your doors with it if that don't work try your manual perhaps a code could be entered into your radio to disable the theft system!!

Its the Anti-Theft System. See what the owners manual says about it, if you have it. Normally, with late model cars a low power 12volt source is first plugged into the cigarette lighter socket to keep the Anti-Theft System from arming, when disconnecting the battery You will have to have it reset at a good garage or dealership.

What do you mean by "ON"? A light flashing? A warning Lighton?

Normally, just locking and unlocking the doors will reset teh alram.

Need more info

dealer only to reset the immobilisor

sounds like chip key is not communicating with host computer. Part of anti-theft. probably a good idea to see dealer.

2005 Ford 500 Limited can't start due to anti theft device, is there a reset I can hit