Hope your enjoying your S2K i had one back in the day with a similar problem. My speedo was flickering on and off turned out to be a bad diode in the alternator you might want to check that out. Other than that it's a great and fun car, I'm still kicking myself for selling it but at the time California smog forced me too.

Ill check it out .
Thanks Alan
By the way your a Senior?
Me too

Nah, just means he posts a lot here. Don't remember the crossover point for number of posts, but hang around and contribute and one day you're a senior senior.

Welcome! I hope it's an easy fix!

Welcome. Let us know what the fix was when you get it figured out. Seems we are all driving old cars here.

Not a Senior Citizen YET! but getting up there. I would like to hear the fix for your problem, as I'm a mechanic and very familiar with the S2K and Honda cars them self.

I am a Senior I am 70 with my 1st S2000 red low miles 24000. SO far the only major fix to check all you ground connections from frame to the ground blocks you might have to maybe add a star washer to get a better ground to the frame and check all pin connections to make sure good contact and not lose. mine were lose plus poor ground contact to frame. So far so good speedometer is working fine no malfunctions. not the VVS or the ECU.
I am guessing just over time and vibrations poor ground and lose connections this happened. Hope this is helpful to all.
Good Luck Alan

Welcome to the S2000 world. I'm 73 and have two at the moment, an AP-1 and a 2008 CR. Owning them can be an (expensive) addiction.

I live on the West coast these events are a bit of a ride trying to keep the miles low on the S2000 Ill wait for a local event I plan to take ride on Hwy.1 for a few days.
A real test for the speedometer and my wife loves to drive the S2000 she is very good behind the stick, Not a road racer or a drag racer but she can handle a stick very well.
The wife is 69 but love her GLK350 2015 better for driving in traffic on the Freeways

SO far the only major fix to check all you ground connections from frame to the ground blocks you might have to maybe add a star washer to get a better ground to the frame and check all pin connections to make sure good contact and not lose. mine were lose plus poor ground contact to frame. So far so good speedometer is working fine no malfunctions. not the VVS or the ECU.
I am guessing just over time and vibrations poor ground and lose connections this happened. Hope this is helpful to all.
Good Luck Alan[/QUOTE]
Nov. 25 took my S2000 for long ride the speedometer still malfunctions, and now the check eng lite is on but the speedometer works in between bumps when warmed up with the light on, I think that there is still something lose or shorting some where. more to follow.


I found a old yellow box connected to the speedometer so I disconnected it .
Then I took my S2000 for a ride about 1.5 hr. up hills down freeways and curvy roads and no more problems speedometer is working fine again but maybe need to get a new yellow box the speedometer is off +5MPH so at 55 mph I am actually 50 MPH which is good I wont be speeding.