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4 Wheel Drive/SUVs/Vehicle speed sensor


Which sensor controls the speedometer on a 2002 Ford Explorer, and it's location?


The Ford Explorer relies on a speed sensor to provide the computer with speed information. The computer uses this information to shift the transmission, and to supply the instrument cluster with the vehicle speed for use with the speedometer and odometer. If the speed sensor fails, the transmission will shift poorly and the speedometer will fail to register correctly, if it registers at all.

The speed sensor costs around $25 on line, and is easy to replace.

   How to Replace a Ford Transmission Speed Sensor

Things You'll Need

   2 wheel chocks

   10mm box wrench


   Drive the front wheels of the Explorer onto the ramps. Set the parking brake and place the wheel chocks behind the rear wheels.

   Climb under the Explorer below the driverís door. Locate the speed sensor, which mounts on the driverís side of the transmission. Unbolt it using the 10mm box wrench.

   Pull the sensor out of the transmission and disconnect the sensorís wiring harness from the Explorerís main wiring harness by hand.

   Bolt in the new speed sensor with the 10mm box wrench. Plug the new sensorís wiring harness into the Explorerís main wiring harness by hand.

   Climb out, move the wheel chocks and drive the Explorer off the ramps carefully.


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Carl Brandt


Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles, and I suggest that you obtain a repair manual for mechanical problems and do some research before asking your question. Most mechanical questions can't be answered completely without looking at, or listening to the vehicle in person.


40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Certified off-road instructor - Certificates in engineering/electronics

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