Hi all I’m new here and at a loss so forgive me if this is a bit long I’ll try to make it short so my parents owned this car since 2023 it’s a focus 1.8 petrol 2002 and it was on 55,000 miles at the time looked great underneath etc they’ve had the clutch switch changed as it was leaking about 6 months ago but it was just leaking wasent making a difference to the car other than that they have never had a fault with the car apart from the mph not going up and mileage disappearing while she was on the motorway but it returned after a couple of minutes anyway she gave me the car 3 weeks ago currently on 67k so I thought great what a steal ordered a whole service kit as I always do before I drive any new car to me I started it up to get used to the dials and position etc and noticed whilst going round the block that the mph was not rising or mileage was not increasing and then as I was downshifting to 3rd, 2nd or first while I put the clutch pedal in the battery light would appear and go off once the clutch was depressed and even worse if I went to slow down to go round the corner say 2nd if I dint tap the throttle for the revs they would drop to much and the car would just cut out, no steering nothing then would have to restart and also if I’m coming to a stop at the lights I’ll go into neutral and the revs would drop right down and back to normal once it stopped or it would completely cut out then to top it off if I go over 55 on the motorway the tcs light would illuminate meaning it’s not active  and mileage will then go all dashes and the idle revs rise to 1000 just sounding rough but again no difference in the drive I’m unable to turn it back on aswell once this comes on the dash I have to turn the car off and restart then it’s fine until I reach speed again now I plugged my code scanner in and it was showing as output speed sensor so to me that’s the vss as I’m aware these cars are known for them going so ford wanted 170 for one I couldn’t justify that and paid 60 for an identical one got the mechanic to change it made no difference whatsoever it was also changed in 2022 before the family owned it I know there was a watchdog about this but I don’t think they’d help now I’m really at a loss guys any help please I think it’s something simple ! Also heard it could be the dash but is it really likely that it would be the issue as this seems to happen on a timed basis when I do a certain thing with the car and all the dials work etc on the dash  I think there all linked but I don’t know what could link them I’m also getting electric shocks when I touch the drivers outside door lol haven’t tried the other side 

so things I’ve done so far : checked fuses 

checked the earth points under bonnet I’m not a mechanic but I like to learn and I believe I done it the right way not sure correct me if I’m wrong but I placed the positive end of the multimeter on battery and negative on earth points to check voltage and it was the same as the battery with ignition off but they were looking a little green I will say 

checked for loose wires coming off battery etc nothing there clamps are not all the way down but I don’t think that’s the issue as it was fine before I got it these issues all happened suddenly 

checked the battery voltage 12.78 with ignition off and 14.78 with car running checked the fuses underneath glovebox all good mind you I’m only checking to see if there burnt or snapped i think that’s good enough ? 

i dont see how the vss sensor would cause the battery light to come on during downshifts and this tcs light to come on at above 50mph but that also makes the mileage disappear to dashes so then again i think maybe it is but why would the tcs light come on then vice versa i dont want to keep throwing money at it but honestly believe its something stupid, if it’s the dash I mean I can get it tested for £45 if not faulty and if it’s faulty they will rebuild for £99 Amy advice please I know some people has been having these issues forgot to mention the gear changes don’t seem as smooth either 

ive heard there’s a menu you can get into through the trip button to look at the vss but is that the case ? 

see the answers in your other thread.

Duplicate posts just end up causing confusion.