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sorry if this is in the wrong section i couldnt find anything that would suite it better. so what my problem is when i drive the needle on the speedo somtimes tends to jump around and also it indicates false speed so when the speedo shows im doing 60 im actually doing 50 is this somthing simple ? like a loose throttle cable or somthing ? any help would be greatt its a 2000 civic se all 100% stock just a k&n air filter

 
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90% it's a VSS - Vehicle Speed Sensor, or wiring. It should be placed somewhere near a gearbox. check for it in the service manual. Haven't got it? google it
other 10% it's a speedo gauge

 
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I’ve had similar problems with my 5th gen. Civics, and it ended up being the speedo. After searching web I found it to be a problem with this generation of Civics. It seemed to worsen after pushing the odometer reset. I replaced mine from salvage yards.

 
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I have the exact same car, 2000 civic SE and mine does the same, its really irritating, it gets stuck on like 70 sometimes and i will slow down to 30 before it changes. Any ideas? its not that it's always wrong, just really jumpy. Did you find anything on this yet sparky?