Anti-theft problem

If the anti theft light is coming on, the system is shutting down the engine. I hate to say it but you need to take it to a dealer to have the problem diagnosed. They are the only ones with the proper test equipment.

I would appreciate your response.

Take care,

Joe

Check for codes?
Place ignition key along and away from the rest of what else you have on your key chain
Check if had a remote starter was put in the car as that may be also the cause

You need to have the car plugged into a diagnostic computer i'm afraid. To rectify the fault.

DESCRIPTION
The passive anti-theft system is designed to prevent driveaway thefts. The system is passive in that it does not require any activity from user. System uses a radio frequency identification technology to verify proper key is being used to attempt to start the vehicle.
During each starting sequence, Passive Anti-Theft System (PATS) transceiver module, located behind steering wheel column shroud, and contains an antenna connected to a small electronic module. PATS transceiver module reads encoded ignition key identification code, during each vehicle start sequence. If identification code is programmed into anti-theft system, vehicle is capable of starting. If identification code is incorrect or missing, vehicle is prevented from starting.
PATS module communicates with Powertrain Control Module (PCM) through Module Communication Network (MCN). PCM then determines if engine will be enabled to start. If PCM prevents vehicles from starting because of PATS, a Diagnostic Trouble Code (DTC) will be stored in memory.
PATS vehicle protection system consists of: PATS transceiver module, THEFT indicator light, encoded ignition key, PCM and Data Link Connector (DLC). A maximum of 8 keys can be programmed into system.
OPERATION
THEFT INDICATOR LIGHT
THEFT indicator light, located in instrument cluster, is used to prove out system operation status. Passive Anti-Theft System (PATS) uses THEFT indicator light when ignition switch is in START or RUN positions. THEFT indicator light will turn on for 3 seconds, then turn off. Vehicle will be enabled to start. If there is a problem in PATS, THEFT indicator light will flash rapidly or glow constantly for more than 3 seconds when ignition is turned to START or RUN positions.
ENCODED IGNITION KEY
When ignition switch is in START or RUN positions, Passive Anti-Theft System (PATS) transceiver module initiates encoded ignition key interrogation process. Each encoded ignition key must be programmed into Powertrain Control Module (PCM) before is can be used to start vehicle. This encoded ignition key is much larger is size to accommodate electronics located inside plastic cover.
PASSIVE ANTI-THEFT SYSTEM (PATS) TRANSCEIVER MODULE
Passive Anti-Theft System (PATS) transceiver module communicates with encoded ignition key. During each starting sequence, PATS transceiver module reads encoded identification code and sends data to Powertrain Control Module (PCM). PATS uses PCM to enable or disable vehicle.
PROGRAMMING
SECURITY ACCESS PROCEDURE
NOTE:Security access is used to erase ignition keys, enable/disable spare key programming switch or perform parameter resets for Passive Anti-Theft System (PATS) transceiver module. This procedure has a 10 minute time delay prior to security access.

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition switch to RUN position. Enter Powertrain Control Module (PCM). Select SECURITY ACCESS PROCEDURE. After 10 minute time delay, NGS tester will display command options. Select as many functions as required before exiting menu. Once menu is exited, security access procedure must be performed again for additional commands.

Hello,

To hard reboot the system remove the negative battery cable and touch it to the positive battery terminal this will discharge all system capiators and give you a fresh start. this guide can help as well.

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please let us know if you need anything else to get the problem fixed.

Cheers

-Check for exhaust leak at the exhaust manifold, cat. Converter, and pipe (before downstream O2 sensor).
-Check your o2 sensors
-Check your cat. Converter

Have to have it checked for open switch
Best way to go about it is to having it scanned for codes and check for malfunction door switch
Scan tool is needed

If it doesn't shut down with the door, I hate to say it, but it has to go to the dealer. They are the only ones that have the equipment to test the system and determine where the problem is coming from.

It is built into the computer and cannot be disabled.

Did you try another key?

You may end up at the dealer as they are one of the very few that can program the security system for fords.

Roy