2000 523i Auto saloon. Intermittent fault - first start of the day (usually), the ABS and ATC lights stay on. No speedo reading and "miles of fuel remaining" readout is erratic. If I drive about 4-5 miles and then switch off for a few minutes, the fault clears on switch-on. Usually it will stay correct for the rest of the day (but not always). Local main dealer has replaced both rear wheel sensors in turn - fault remains. He now wants to try a new control unit at about £700 (about the car's total value). I think it may be the power supply to the electronics - please has anyone had this problem and resolved it.