Start reading here: http://www.ford-trucks.com/forums/23...d-ii-code.html
and listen to anything Rockledge has to say (trust me).
You could also disconnect C309 (located directly under the driver seat, accessed from UNDER the cab, loosen the bolt in its center) and clean out any corrosion you may find. At the very least, disconnect/reconnect repeatedly to scrub crud off the pins. I also recommend a good gob of dielectric grease to keep water out. This is worth a shot, because that connector has caused a slew of issues with tail lights, etc. It goes without saying (so I'm saying it anyway) that you should do the same with the FF Sensor connector too.
edit: Thanks Badluck: I completely MISSED the question on its LOCATION !!!
Inside the DS framerail.
2000 2.5 MO5D 4.10 one-wheel drive DD - gave to my older son
1990 STX 87 2.9 going in.....Junked it
2000 3.0 4WD M05D 4.10 S-cab Off-Road package with 235-75-15" tires, hotrod DD, lol
Last edited by Earl43P; 06-05-2008 at 01:07 PM.