Age nearly 12 years
Mileage about 15000 (only did 5000 miles in first 10 years)Always been garage maintained but nothing much needed
Current problem started about 3 months ago
Overtaking at about 60mph and engine moved to too low gear and high revs, After switching off completely and re-starting OK until reaching 50-55mph then problem recurred (but can goes for days without happening).
Yellow 'transmission' warning light comes on during problems.
Been to ex Rover garage 4 times:
1st time diagnostics showed problem in Speed sensor or in any of 4 wires.
2nd time. Wiring checked. Seemed ok afterwards for a while then recurred ... and at lower speeds (30mph) on 2 occasions.
3rd time: diagnostics again and suggested change speed sensor
4th time: changed speed sensor.
It seems to behave better for a while after each visit and then problem recurs.
Wondering if problem in wiring which is disturbed during tests. Garage suggests there may be an additional internal gearbox speed sensor.
Yes - this was the first thing that was done before it was sent in for diagnostics.
They have done fault code checking but another garage may be able to do live data tests.
I have a suspicion that the garage who put in a new speed sensor may have changed to wrong one. One goes to the speedo (the one they changed despite there being no speedo problems) and the other was connected with the specified wires directly to the ECU. I thought they were going to change the latter one.