Question about 1999 Ford Expedition

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My 99 Expediton suddenly does not recognize any of the keys. The anti theft light flashes continually with key in ignition. Any suggestions?

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MAKE SURE BOTH KEYS HAVE CHIPS IN THEM.IF TOP OF KEY SEAL THEM CHIPS ARE IN THE KEYS. YOU THEFT SYSTEM NEEDS TO BE REPORGRAM, MOST LOCK SMITHS HAVE THE COMPUTER TO DO THIS.

Posted on Nov 12, 2009

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2002 Ford Explorer will not start. Theft light flashes and makes a continuous ping noise.


This happens if you put the wrong key in accidentally. Get into the Explorer and insert the known correct key into the ignition and turn it. If you use the wrong key, such as one that was cut to open the doors, the system will remain armed. If the car then starts, then you have disarmed the anti theft system. If not, move on to this: Ford Explorer keys have large black plastic, or molded rubber, heads. Inside the head is a transponder chip that is programmed to a certain code so that the transponder recognizes the key. When you are sure you have the correct key, try to start the car with the spare, if you have it. If the car still refuses to start, move on to next step here: Wait 15 minutes, until you see the flashing rate on the red light on your dashboard decrease to normal speed and then try both keys again. If this still fails to start the car, raise the hood and disconnect the battery for 15 minutes, then reconnect it and try again.

Jul 18, 2016 | Ford Cars & Trucks

1 Answer

I have a 99 jeep grand cherokee 4.7, the alarm went crazy and the wont start. guages dont budge and horn keeps honking and lights flashing. sentry key light is on in guage cluster any help


Sounds like you need to perform a relearn on the anti theft system, it's not recognizing the key if this happens with the key inserted. Might want to look online for a reset procedure for Jeep. GM has you keeping the key in the ignition in the on position for 10 minutes.

Jul 17, 2014 | 1999 Jeep Grand Cherokee

2 Answers

My theft light is flashing but my 1997 expedition wont start.The vehicle turns over but just don't start.


ANTI-THEFT SYSTEM Passive anti-theft system
Your ignition key has a unique imbedded transponder which engages engine electronics and allows the vehicle to be started. Without the use of your special ignition key, the vehicle will not start.

During each vehicle start, the coded key is read by the anti-theft system. If the key’s ID code matches the code in the anti-theft system, the vehicle is enabled to start.

Anti-theft system
Briefly illuminates when the ignition is turned to the ON position to verify that the passive anti-theft system is operating properly.

Also, its possisble that tou have actovated the fuel pump switch.

CHeck it.

Jul 20, 2010 | 1998 Ford Expedition

1 Answer

Anti theft is stuck on my 2001 expedition


hello hope that can assist you have a1998 expedition had the same problem took t to butler ford in milledgeville ga my wires on alarm system had begun to touch 170.00 2hours and they had me riding again alarm system had to be rewired.JERMAINE DRUMMAND111

Feb 02, 2010 | 2000 Ford Expedition

2 Answers

Car turns over but won't stay on. Electrical works fine though


the ignition switch in dash may have in theft mode. after turning on key not to start does security light flash or stay on? if so hook battery charger on car, then turn key on for roughly 30 min till security light goes out. that resets theft mode.

Sep 06, 2009 | 2004 Chevrolet Malibu

1 Answer

My 1998 ford expedition won t start and the theft


the light blinks when the system is armed. Normal.

Your key has to be able to communicate with the receiver in the ignition area. Does your other key work ok?

Anti-Theft The passive anti-theft system (PATS) uses radio frequency identification technology to deter a driveaway theft. Passive means that it does not require any activity from the user.
  • During each vehicle start sequence, the ignition key identification code is requested by the PATS module.
  • If the key's ID code has been programmed into the system, the vehicle powertrain control module (PCM) (12A650) is allowed to operate; this allows the vehicle to start.
  • If the key's ID code is not programmed into the PATS module, or if no encoded key is detected, then the vehicle PCM is disabled.
The PATS module, located under the driver side instrument panel, communicates the state of the security system to the PCM via the module communications network. The PCM, based on the communications from the PATS module, will determine if the vehicle's engine will be enabled to start. If the PCM prevents the vehicle from starting because of PATS, the PCM will store a DTC in memory.
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The anti-theft vehicle protection system utilizes the THEFT indicator, located in the instrument cluster (10849), when the ignition switch is turned to the RUN/START position. The indicator provides system prove out and operating status to the customer or technician.
Each PATS ignition key holds electronics that give each key a unique ID code.
The PATS will activate the indicator signal when the ignition switch is turned to the RUN/START position. The THEFT indicator will turn ON for two seconds, then turn OFF.
If the THEFT indicator flashes for one minute or more, this indicates that there was no key code received.
When the vehicle ignition switch is placed in either RUN or START, the PATS module requests the ignition key ID code. The PATS module requests the ignition key ID code by supplying power, ground, and the carrier signal to the transceiver to energize the ignition key. After the energize period, the key transmits its ID code to the transceiver module, which sends it to the PATS module.
The PATS module then compares the received KEY ID code to those stored in memory (16 maximum). If the ID matches, the PATS module sends an enable signal to the PCM over the module communication network.
The passive vehicle protection system utilizes the engine management capabilities of the PCM to enable or disable the vehicle engine. The module communication network is used to send and receive messages to and from the PCM.
Within one second after engine start, the PCM must receive an enable signal from the PATS module through the module communication network or the engine is disabled before the vehicle can be moved.
If the PATS module recognizes a stored ignition key code but there is a module communication network concern preventing the PCM from recognizing the start enable signal from the PATS module, the vehicle engine will be disabled. If this happens, the PATS module will flash the THEFT indicator for one minute, then flash diagnostic trouble code 16 ten times to indicate there is a problem with the module communication network circuits or the PCM is not responding properly.
The passive vehicle protection system will disable the vehicle from starting if there is a:
  • Damaged encoded key.
  • Unprogrammed key.
  • Non-encoded key (key has no electronics).
  • Wiring concern.
  • Transceiver concern.
  • Control module concern.
  • Module communications network concern.
  • ----------------------------------------------------------
Key Programming —Spare Key NOTE: Before starting this procedure, make sure the key(s) you want to program have the correct mechanical cut.
NOTE: Performing this procedure does not erase existing programmed keys.
  1. Insert the programmed key in the ignition. Turn to RUN.
  1. THEFT indicator proves out after two seconds.
  1. Remove the programmed key.
  1. Within 15 seconds, insert the new key in the ignition and turn to RUN.
  1. THEFT indicator proves out after two seconds.
  1. The extra key is now programmed.
------------------------------------------------------------------------------------
Key Programming —New Key (Without Diagnostic Tool) NOTE: Before starting this procedure, make sure the key(s) you want to program have the correct mechanical cut.
  1. Insert the nonprogrammed key in the ignition and turn to RUN.
  1. THEFT indicator flashes rapidly.
  1. After 15 minutes of flashing, the THEFT indicator will stop flashing.
  1. Within five minutes after the THEFT indicator has stopped flashing, turn the ignition key to OFF and back to RUN.
  1. After 15 minutes of flashing, the THEFT indicator will stop flashing.
  1. Within five minutes after the THEFT indicator has stopped flashing, turn the ignition key to OFF and back to RUN.
  1. After 15 minutes of flashing, the THEFT indicator will stop flashing.
  1. All originally programmed keys are now erased, and only the key in the ignition is programmed.
  1. Additional keys may be programmed; refer to Key Programming—Spare Key .
---------------------------------------------------------------------------------------

Jun 17, 2009 | 1998 Ford Expedition

1 Answer

Anti theft system


The chip is in the key. Either the key has lost it's program or the transceiver is not recognising the key. Try another key if you have one.

Jan 26, 2009 | 1998 Ford Mustang

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