Vehicle Anti Theft system. You have to use the correct ignition key to energize the solenoid and or other parts for the vehicle to start.
How do you depressurize fuel system to install filter 1998 ford expedition?
You need to refer to the service manual to remove a 2000 Ford expedition XLTS key-less entry system.
2001
The 5.4 liter V8 engine , available in the 1998 Ford Expedition has a Coil On Plug ( C.O.P. ) ignition system
On a 2003 Ford Expedition : ( no ) It doesn't have what GM calls their Active Fuel Management system / Chrysler their Multi-Displacement system , etcetera
On a 2001 Ford Expedition : Both the 4.6 and 5.4 have the Coil On Plug ( C.O.P. ) ignition system with ( 8 ) individual coils
I was looking at the 2007 Ford Expedition owners manual and it shows the instructions for the keyless entry system ( if equipped ) so it was available
chock
I've heard you have to knock out the computer system.
NO not on a stock radio
If you want to reset the anti-theft on your 1999 Ford Expedition, you will have to have your PATS key. Many times, once you insert this key, the ant-theft system will restart.
Your 2001 Ford Expedition has the Coil On Plug ( C.O.P. ) ignition system so there are ( 8 ) individual coils