The D4 transmission light is flashing, the speedometer quit, and the check engine light came on. Fluid is good, and it shiftd fine into all gears. What could be the problem

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!