How do I reset the anti theft system on my 2004 ford mustang 3.9 ?

Is the anti-theft dash light on and steady red? Ford PATS is complex and you may need a mobile auto-electrician or mobile auto locksmith / alarm installer.

1. Insert the key into the driver's side door lock.
2. Turn the key once, but not all the way to unlock the door. Leave the key in this position for 40-60 seconds. ...
3. Do this again, but turn the key in the opposite direction.
4. Remove the key from the door, get into your Ford, and start the engine. The system should be reset.

How to Reset the Anti-Theft System on Your Ford

https://www.google.com/search?q=2004+Eddie+Bauer+Ford+Expedition+reset+security

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You say 'won't turn over'. Do you means the engine is not cranking (turning over), or do you mean it cranks but doesn't 'start'? Did you disconnect the battery when you installed the fuel pump.

The flashing anti-theft light may be a clue here.

1. Insert the key into the driver's side door lock.
2. Turn the key once, but not all the way to unlock the door. Leave the key in this position for 40-60 seconds. ...
3. Do this again, but turn the key in the opposite direction.
4. Remove the key from the door, get into your Ford, and start the engine. The system should be reset.

How to Reset the Anti-Theft System on Your Ford

Or there are videos. You should also check for DTCs, diagnostic trouble codes.

https://www.google.com/search?q=2004+ford+mustang+reset+security+system

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From my experience...
A non PATS coded key SHOULD not turn the STARTER...!

If ANTI-THEFT were invoked... you can attain a not start condition which the Owners Manual says must be cleared by the dealer.

A working PATS key should disable the anti theft... by turning the ignition on... ELSE try your other key.

The SecuriLock [PATS]
passive anti-theft system is not compatible with
non-Ford aftermarket remote start systems. Use of these systems may
result in vehicle starting problems and a loss of security protection.

Owners Guide (post-2002-fmt)
USA English (fus)

OWNERS MANUAL
Ford 2003 Mustang Owner Manual

SHOP MANUAL
Ford 2003 Mustang Workshop Manual

99 F-150 ignition/anti-theft question - Ford F150 Forum - FordF150.net

www.fordf150.net > ... > Electrical (Everything except audio systems)

Sep 16, 2009 - I had 2 keys for the truck, one worked perfectly fine, the other wouldunlock the ... over but the anti-theft light flashes and the engine won't actually start. ...Should I just spend the $80 for the switch and hope that is all it needs? ... for Fordkeys (Later 1998-newer Ford, Lincoln, Mercury) ... Mustang 1998 - 2001

electrical - Can I disable antitheft (PATS) on 03 Mustang ...

mechanics.stackexchange.com/questions/.../can-i-disable-antitheft-pats-o...

Jan 4, 2012 - So my question is: Is there a way to just disable the anti-theft system? ... This will make the car always 'see' a key with a chip. ... as they are usually intertwined with the anti-theft system to ensure the engine will not start. ... Where is the Wiper Relay/Control Module located on a 1994-1998 Ford Mustang??? 7.

How to Turn off Theft System on Cars: 7 Steps

www.wikihow.com > ... > Cars > Car Maintenance and Repair

wikiHowJump to Questions and Answers - Be the first to ask a question about this topic: ... Itwill not start and your battery will die. ... Reset a Check Engine Light ... Thanks to allauthors for creating a page that has been ... How to. Make Oat Flour. Cook Bacon in the Oven ... People are incredibly helpful and open to new ideas ...

Hi, im a retired ford tech, with alot of experience on ford anti theft . Now if you are asking about a built in oem factory anti theft, your not going to be able to bypass it. Now to answer your question, I would say your factory anti theft IS NOT causing your issue. It will make it unable to start,it doesnt kill anything else.

yes as when you change an ignition switch it has to be sync to the computer so it knows the correct keys are being used and the car is not being stolen.

Did you check the battery of the car (maybe loose cable)? but if it just happen suddenly, it might be your altenator that wasn't charging your battery. I think once there's enough power gone through the car then your anti-theft system should work as normal again.

Go to the link. Anti theft light on Mustang how to reset ecu WATCH ALL THE VIDEO STEP BY...

locking & unlocking the doors will reset the anti theft.
Or disconnect battery for an hour and see if it resets.