1999 Ford explorer transponder bypass

That's not quite true. Omega R & D has a bypass module called the DB-PKF. It works on the vehicle's databus and doesn't require a key. It runs around $30. To use it, you would need 2 working keys to program it to your vehicle. Any local Omega dealer should be able to get you one. Or, you could order one online from my company. I don't list it on my site but it is available. I hope this helps.

Mike

You need to wrap the key cylinder with a 22 gauge wire and also the head of the spare key ( or just the chip ) to introduce the resistor to the PATS module. Wire in the relay so that the ground out when running wire activates the relay and use the ignition wire for power only when the ignition is on so you don't have the relay on all the time.

Alright I understand what you guys meant by wire and a key now.  I quess thats how the 555u works its just easier to install for some.  Does it matter how many wraps of wire around it?  I would think that  several wraps would be better than a couple to pick up the induced code.(sorta like a electro magnet?)  Thanks again for  everyones input.  Im glad I found this site, I know a good bit about this stuff but there is a first time for everything.  Thanks again

 BrianH

Wrap around key about 8 - 10 times and the same for the cylinder to ensuer a solid signal going to the PATS system. If you already have a spare key with the correct code then all you need is a relay ( which in my mind is cheaper than buying the DEI  piece ). If you need two keys to program the DEI unit anyway there's no need to have the second one afterwards. If I were you just take the chip out of the key head and wrap the wire around the chip and then you still have the spare key as a door key.