Speedometer problem My speedometer works when it wants to. It will work fine for 30 miles or so and then it starts jumping around and drops to 0.......it will not register for a while, sometimes my whole trip (100 miles or so) and then it will jump back up to speed and work the rest of my drive..Someone told me it was probably the speed sensor but where is it and how do i change it?

Pull your negative battery cable for 30 min see if it resets your sytem. Guages should jump up and drop back then work perfectly. Had to do this with my 2005 monte carlo

The speed sensor might be bad. I used to own a 99 Mitsubishi Eclipse with the same symptons. The car will start, but will not pass the 1st or 2nd gear, the speedometer will be at 0. I replaced the speed sensor and all the problems went away.

I am no Honda expert, but a similar problem happened to my ex sister in-laws Ford Taurus. The speed odometer would jump around and it had trouble shifting (automatic transmission). After driving it I changed out the speed odometer sensor on the transmission and it's been fine ever since. I changed out the sensor because if the cars computer cannot tell how fast the car is traveling then fail safes in place go into effect and the computer will do it's best to keep the cars rpm's down based on the speed indicator and not let it shift or shift properly either. If it's getting false speeds then it will shut down the motor when the speed gets to high and allow it to run as the speeds fall (jumping speed odometer needle). It effects the transmission shift points also. It will either shift erratically or not shift out of say 2nd gear, so that the cars engine can't get damaged based on what signal the speed sensor is sending the computer.

Could be worn out speed sensor.

The speedometer is not driven by the crank sensor. That drives the rev counter amongst other ignition timing things.

hav car scanned at a discount place--there r some bad codes-acuators,sensors or wiring has issues

if both go then its the sensor ,but if car is a 98 then it could be a cable or a speedo cable crive worn out

It may be that the speedo cable has come loose at 1 end and will need to be tightened back up. Sorry but not sure where ends are attached on your car.

it could be a chaffed wire on the fire wall and also still could be the alternator unless it was brand new i would have it checked personally. then start check the accuator for the needle its self

If your transmission fluid level is okay, then you need a new speedometer cable. Its not terribly difficult to replace, but it does require you to pull the instrument cluster. A local Hyundai dealership might be willing to photocopy the specific speedometer cable replacement instructions out of the 2004 Accent shop manual.