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.
by 
cam man
ANSWERS: 4
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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.
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In response to your question it is OEM.
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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!
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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.
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