mondeo problems

I had the same fault on my R: reg (mkii) mondeo. It had an electronic speed (i.e. no cable from the gearbox). The dealer replaced the speedo - all fine. The fuel gauge is controlled by the speedo.

thanks, i have passed that onto him

Now can anyone explain to me how that works, like i said i have never had a modern car, so i have no idea at all ta!

The speedo is controlled by the ECU. There is a sensor that connects to a pinion within the gearbox that does the job a regular cable used to do. It detects a pulse for every RPM of the pinion and sends it to the ECU. The ECU then sends a voltage to the dials to display the correct speed (well, as correct as it'll get). Not sure whether the sender in the tank would send direct to the dials, or if it would go via the ECU. Either way, I'd check both sets of fuses (there are two fuse boxes in a Mondeo - one behind the glove box and one on the nearside of the engine bay), and all earths. It's most likely a related issue.

thanks, interesting