Speed
SOURCE: My 1995 Honda Accord V-6 speedometer sticks at 19 mph.
The speedometer works from a steel sheathed cable that is connected to the drive shat at the rear of the gearbox. The internal braided steel cable rotates inside the sheath connecting the drive shaft to the back of the speedometer. The cable sheath connects to the gearbox casing and the internal cable has a lug that engages with a rotating shaft in the gearbox. The cable connects in a similar way to the back of the speedometer. Your problem is likely to be associated with the cable. It can have become disconnected at either end or, more likely, the internal cable has broken.
Its easy to check out. Find where the cable come through the firewall between the passenger compartment and the engine compartment then follow it down to where it connects to the gearbox. Disconnect it and see if it is broken. Alternatively you can find where it connects to the back of the speedometer and disconnect it there. If it is broken the internal cable will come out of the sheath.
Replacing the cable is easy enough but requires some scrambling around under the dash.
SOURCE: my accord speedometer stays in 20 m/hr when its running
It might be the part that goes directly to the transmission. Its right under the speed censor. It has two hoses attached to it, and three 10mm bolts. To remove it, first remove the cable attached to the speed sensor, then remove the two hoses (power steering fluid will spill), remove the three bolt, After that's off, you have to wiggle it out, which might be really hard because sometimes it comes out easy and sometimes it doesn't. This piece has a gear at the bottom that could have worn out, and replacing the top part alone might not solve the problem. Hope this helps, good luck.
P.S. when this is out, you cant drive the car.
SOURCE: I have 1992 Honda Accord LX. My speedometer
your speedometer cable could be old and worn which will cause it to give the wrong reading also check your relays located under the hood
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