Hopefully you don't have a problem with me sharing here what i found and did .. if you do then please pm me and i'll delete it ..
Non present fault code for a misfire on Cyl . 4
Values of sensors found to all be in spec .. some adaptations to the fueling which is pretty normal and nothing that stood out as a problem .
Fault code cleared and adaptations reset .. it will take a while for the car to re adapt and settle down .. again normal .
The fault is a high rpm fault only so non present at time of checking , this is consistent with a weak spark , it could be other items but with something that's not at fault at time of test then we have to go for the obvious faults .
Ive replaced the coil and spark plug on that cyl but due to the work involved i felt it best to change all the plugs whilst i had the car apart which we spoke about .
i would suggest we put a tick in your service book on the minor service to say plugs changed .. you will now have the plugs done on a minor service and not the major service going forwards .
In other words your next service will be cheaper .
I road tested the car at 5k rpm in 1 , 2 and 3 gears and had no further fault codes or misfires .
I'm not comfortable trying the same in any higher gear but i did the above several times and had no recurrence of the fault.
On the VDC there were a few fault codes but all other than one were what i would call battery related .. not a flat battery as such but a low charge one which often happens on a startup so of no concern .
The active code seems to refer to the side lights .. the headlight switch does not illuminate when the side lights are turned on but does when dip beam is on .. it would need investigating but i suspect a headlight switch would be needed and its really of no concern i feel so not worth the cost .
i'm afraid as i often say .. i have no control over pricing at my garage , but it's not a lot more than a plug change imho.
Car needs to be cleaned which will be done tomorrow morning as i didn't finish the car till 5pm .
EDIT ..
I'm afraid i didn't quite get 200 bhp