1999 ford f150, anti-theft will not allow to start at times have to wait for reset of computer. Dealership can't fix. spending money on their quesses. need help to fix or bypass anti-theft system.

Ford OEM anti-theft systems are more difficult to deal with and fix than most other systems.

The easiest route to go is to bypass it completely and make the vehicle think it has a transponder key in it at all times. It requires a bypass kit such as would be used to enable a remote start system on your vehicle.

You can look up the proper bypass transponder for your vehicle here:
http://www.bypasskit.com/affiliate/index.aspx?sid=281928323&l=scytek&s=W

And you can order it from www.remotestart.com

Looks like the easiest way to go, if it will solve the problem you're having.

You can learn alot more about your system by typing "Ford PATS" (Passive Anti-Theft System) into a search engine.

Good Luck!

I'd love to try to answer your question, but I'm going to have to ask you a question first.

Is the anti-theft on this truck OEM, or is it aftermarket?

If it's an aftermarket anti-theft system, you'll need to know the brand.

I delt with this on a GM vehicle recently. It had very similar symptoms. It turned out to be an aftermarket anti-theft system that was added on to the vehicle. Once I found it, and found the brand name, a little internet research gave me most of what I needed to know to simply remove (maybe a better word would be disentangle) the entire system from the vehicle.

If yours is aftermarket, I'd recommend doing the same thing and saving yourself a ton of headache in the futiure.

I have had s similar problem with my F-150. It always seems to happen when I am in a hurry. It occurred to me that it may be due to popping the key in and turning it too fast for the computer to recognize the chip. Since I have slowed down the problem has not recurred.

In response to your question it is OEM.

This problem started for me after I replaced the stock radio with a aftermarket CD player. This is what I need to do to start my truck.

1. Pop the hood and disconnect the negative battery cable from the battery.
2. Reconnect the negative battery cable to the battery after about 5 seconds. ( Power to the truck work now)
3. Turn the key to the run and count to three.Then turn the key to off. Do this 3 times.
4. After you turn the key to off the third time. Start the truck. It should fire right up.

All your doing is retraining the computer to recognize the chip in your key. It's a quick fix. It takes less then 5 minutes to do. The down side to this is it happens about once a month. So I always keep a 1/2 inch wrench in my truck so I can disconnect the battery. I suggest you do the same. The only other way to solve this problem is to buy a aftermarket bypass system to bypass Fords PATS (Passive Anti Theft System) and have installed. Good luck, and I hope this helps.