If the speedometer does work, but the odometer doesn't work, then you have a bad speedometer head assembly. The speedo head is a microprocessor that gathers the info coming from the vehicle speed sensor and translates it for you on the speedo and the odo. If one is working, but the other isn't, then it is getting the VSS signal, it just isn't processing it right.
You could also be experiencing the below issue:
The Brake Pressure Differential Deactivation Switch (SCDS) (2B264) located under the Master Cylinder (Behind the Air Filter) over time develops a leak. This causes a short and a fuse trip, fuse #10 if the engine is on. This leak also causes brake fluid to wick down two wires to the ABS brake module (2C219). The fluid accumulates on the (always on) power connectors for the ABS brake system which are powered by fuses 101 and 102 and are both 40 amp. The fluid attacts moisture, road salt and leads to a fire when the fluid and moisture act as conductor between the hot leads and ground. This switch has been the subject of other Ford Recalls, just not the Windstar van yet. Below is a picture of the switch in question. Notice the fluid that leaked on the part below it. This switch will cause cruise control problems, speedometer, odometer and ABS brake system problems.
AnswerSounds like a disconnected wire\ground or a failed sensor. Odometer gets usually get some of its info from the speed sensor located on the Transmission. I would check the connections of this first.Another possibilityThis symptom (dashes in the odometer) has also been linked to a leaky brake switch.See "Related Questions" below for more and links to an outstanding write-up for replacing the switch.
Your Windstar is subject to a Ford recall for the cause of this problem.The cause is a leaking brake pressure sensor screwed into the bottom of the master cylinder.I would suggest contacting your Ford dealer confirm your van is covered (I believe every single Windstar is part of the recall), and arrange for the quick and easy repair.See "Related Questions" below for more
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