OBD II computer


Asked by Sep 07, 2016 at 07:54 PM about the 2004 Ford Explorer Sport Trac XLS 4WD Crew Cab

Question type: Maintenance & Repair

My 2004 Ford Explorer Sport Trac
OBD II won't communicate with
the computer. I turn the ignition on
go to the start position and
nothing happens. I have no fuel at
the Schrader valve. I can get the
engine  to roll over using the
starter relay. The theft light
doesn't blink rapidly. I'm lost and
need to get my truck back on the
road if anybody could help it
would be greatly appreciated.

5 Answers


First check for blown fuses in both boxes, and use a test light or remove then one at a time and run a continunity test on each one, if that checks good then the relays are next. On the security system, make sure the light is off, if it is on steady then the system is is lock down and it won't start until it is turned off. That procedure is listed in the owners manual.

1 of 1 people found this helpful.

Checked fuses and relays. The light blink when the ignition is off but shuts off when I turn ignition on. That's why we're stumped


That's what mine does and when you arm it it glows steady. So it sounds like it is operating properly. It is likely that the ignition switch just maybe bad. Have you tried removing it and see if you can get it to crank by moving it to the crank position by hand?


Not yet I'll try that. Mine doesn't have a regular alarm system. It has the passive anti-theft system


Passive systems, they seem to foul up a lot, you might think about removing it and solder and shrink wrap the joints, then you back to stock.

Your Answer

Explorer Sport Trac

Looking for a Used Explorer Sport Trac in your area?

CarGurus has 1,659 nationwide Explorer Sport Trac listings starting at $1,650.


Ford Explorer Sport Trac Experts

  • #1
    Wayne Foy
  • #2
    Tracy Hooks
  • #3
View All

Related Models For Sale

Used Ford F-150
2,535 Great Deals out of 221,934 listings starting at $1,222
Used Ford Explorer
878 Great Deals out of 64,708 listings starting at $1,200
Used Nissan Frontier
358 Great Deals out of 24,707 listings starting at $1,550
Used Toyota Tacoma
452 Great Deals out of 41,046 listings starting at $2,600
Used Chevrolet Colorado
264 Great Deals out of 43,285 listings starting at $2,200
Used Ford Ranger
108 Great Deals out of 4,706 listings starting at $1,100
Used Chevrolet Silverado 1500
2,236 Great Deals out of 151,900 listings starting at $1,499
Used Chevrolet Avalanche
134 Great Deals out of 4,478 listings starting at $2,500
Used Dodge Dakota
60 Great Deals out of 3,168 listings starting at $1,500
Used Dodge Ram 1500
342 Great Deals out of 9,663 listings starting at $800
Used GMC Sierra 1500
908 Great Deals out of 59,399 listings starting at $1,980
Used Ford Mustang
294 Great Deals out of 38,678 listings starting at $1,995
Used Ford F-150 SVT Lightning
97 listings starting at $9,995

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.