Speedometer quits working and D4 light flashes on 1995 Honda Odyssey. The Vehicle Speed Sensor (VSS) is bad. You will need a replacement ($39 online) sensor, Ratchet with extra long extension, 10 mm socket w/ swivel, a long flexible wand with a magnet on the end, and a flashlight. Unplug the wire from the old VSS. Remove the two mounting bolts. Lift out the old VSS and the drive key. Put a small amount of grease on the new drive key and insert it into the new VSS. Plug the wire into the new VSS and use the wire to lower the VSS into place aligning it with the two mounting holes. Use the magnet wand to lower the bolts into the holes and turn to just get the bolts started. VSS IS FLUSH WITH THE TRANSMISSION BEFORE TIGHTENING THE BOLTS. You are now finished. You can access the VSS from the top of the engine in your garage/driveway. It is located on the top/backside of the transmission, just below the air cleaner hose. Best done in the morning when the engine is cold unless you like getting burns on your forearms. Good luck!

SOURCE: Vehicle Speed Sensor replacement

Hi...
The SPEED Sensor on your Honda accord 94.
is located on the Transmission.
About Under the Thermostat housing ( if you follow the lower radiator hose from radiator to engine) you will found the thermostat housing.
Under the thermostat housing you will see on the trans, the sensor is the only one on this side of the trans,

I hope this help on your problem.
Thank you for use fixya...

SOURCE: drive piece not spinning VSS pin to make speedometer work

yeah it can be replaced try a junkyard first.you might be able to get away cheap.i had the same problem in a 93 accord got mine from junkyard worked great after that

SOURCE: 1995 Honda Odyssey LX

I have same ****

SOURCE: No speedometer, D4 flashes, No

Disconnect the negative terminal battery for 30 minutes then reconnect the battery.This resets the computer.Then check.If still the same problem is noticed, that means the problem is with the speedometer connections or speedo itself. ----------Under the speedo there are few wires connecting to its circuit board.If any of the wires gets loose, then it will not let the speedo to work.Or if the speedo circuit board itself is short, then it will not let it to work.Both possible:--- Also one more time.Remove the speed sensor, with battery unplugged, then clean the new sensor terminals.Cleat the area where you are inserting the sensor, then re fit the sensor and check , if that helps.If not then check the voltage at VSS connector.Checking the voltage will confirm, that VSS is receiving correct power to function.-------------- To get exact instructions for how to check voltage and how to check speedocircuit board, click this link below and follow the instructions:----- http://howtobyme.blogspot.com/2011/06/d4-flashes-on-honda-acura.html ------------ This should help.thanks.Helpmech.

SOURCE: Vehicle Speed Sensor

Cvt transmission is continuously variable transmission. VSS is vehicle speed sensor. A faulty sensor can make the transmission run erratic.