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If the speedometer works, but the odometer is not working, there could be a fuse blown if the odometer is digital. If the odometer is not digital, then a gear is broken in the speedometer cable. It should be replaced.
Break pads should be checked if not replaced. Check condition of rotors at the same time.
Should read "...speedometer and odometer don't work..."
Most Mercedes Benz Techs will suggest replacing your battery every 7 years.
you need to change the speedometer cause if your odometer is counting then speedometer should be working too. make sure your speed gear its working its in the side of the transmission The odometer and speedometer read off of the same signal. If one works, the signal is ok and the other gauge is bad.
This is very common on the 1996 Ford Escort unfortunately. Basically the speedometer cable has to be re-greased or the speedometer has to be replaced with the older 80mph model. Both "fixes" require disassembly of the dash to get to the cable/speedometer. See the ford escort owners association for more details/instructions.
The speedometer is wired to a VSS. If it has failed then the unit will need to be replaced. Odometer and trip meter are wired into the same fuse and should be checked. If the fuse is blown the odometers will not work.
Speed sensors generally are not serviceable. The sensor needs to be replaced. It should be an easy change out, either bolted on or screwed in.
It doesn't have a timing belt...it has a metal timing chain...these do not standardly wear out for a very long time.
if he doesnt know how then he must not be a very good mechanic, i have a 92 Spirit, same engine and trans as your caravan, that's if your packing the 2.5L engine... the speedsensor in the back should have the speedometer built
if i remember correctly they did not start using an electronic speedometer in f150's till 1992 so your vehicle should still have a mechanical speedometer which has a cable ran down to your transmission. the sensor on the rear differential on those models is an abs sensor on 92 and later its the abs and speed sensor.
Take your auto to your local Merc Shop and they should be able to reset your cpu for free.