My car is a 7 year old Corolla GS diesel. Every now and then I have weird problems with the dashboard; 2, in fact. The first is that, on quite a regular basis, the speedometer will just drop to zero. Often, at the same time, the orange 'engine' symbol on the dashboard will light up, which the owner's manual helpfully tells you means 'take back to dealer'. Thing is, often after a while the speedo will come back up and work again, and almost always when I turn the engine off and on that orange light disappears and the speedo works again. I did actually take the car to the dealer about this, but they seemed pretty clueless and very expensive. They said it could be a problem with the dashboard component OR some component in the gearbox, and to fix both would be about £500 in parts alone. I told them not to do the work, and was hoping you guys might have slightly more of a clue. ;) The second is a more minor problem; of late, the fuel level needle has started waving around way more than usual. Especially when I'm on low fuel, the thing can go from half-full to completely-empty, based on whether I'm braking or accelerating. Surely it shouldn't do that? Is there some component in the fuel tank that can come loose or something and cause this? Could it be an electrical problem?