My 240 wagon has a functioning speedo but non-functioning odometer. I've been told that if I send the speedometer out to a repair facility see eBay or speedometer.com or a local shop that for about $150 I can get the unit repaired. I've also read in an old copy of Rolling that the problem is the plastic gears on the side of the unit which transfers speedometer info to the odometer. I've had the unit out of the dash, which isn't hard to do since on my version its held in by four screws and wedged between the light switch plate and the additional gauges. The electronic unit has a circuit board with a chip on it and what seems to be two motors one for the speedometer and the other for odometer and trip odometer the gears I'm talking about are on the odometer motor to the side of the speedo motor. I think the board translates the electric impulses from the rear axle counter to the speedo and the odo in a fashion as to goven the speed of the electric motors that drive the gears. Exceptionally complex for an seemingly analog device (the speedometer and odometer). Probably Volvo should've left the design as it originally was, a cable driven off the rear shaft of the transmission by a set of gears into a mechanical speedometer and odometer that was mechanically powered by the turning shaft. If they were going electronic they should've gone to a led display for the instrument like many U.S. automakers did. Then we wouldn't have these problems after 150k or more. We'd have the problem of replacing the LED display when the materials that it consist of decompose from time or electric current being passed through them. 6 or one half a dozen of another?