Just wondered if anyone out there has had the same fault I have on my is200 03 plate.The steering wheel has started to vibrate quiet violently intermittently.There appears to be no pattern as to when fault occurs.First started at approx 60mph and could drive through it..Now getting worse and occurs from approx 30mph up to 60..Car does not pull to either side.There are no unusual noises.Thought it was the old tyres.Had 4 brand new tyres fitted Saturday and balanced..Still occurs.Power steering fluid appears ok and checked all belts .The very strange thing is that it will occur very often but then when I turn round and drive the same road under the same conditions it can be ok.Spent 5 hours yesterday in the rain swoping tyres.removing belts checking suspension and road testing .The feel of the pas is good,does not go heavy or light.Fault can occur with air con on or off ,thought a.c. or other pulleys may be tight or seizing.Fault occurs when engine is hot or cold..Engine and gearbox all good.No other work been done on car.Suspension and brakes all good.Thought I knew but about cars but never known steering wheel to shake very violently between 1 to 2 inches then when slow down for few minutes or leave engine to idle and set off again fault can go for next 10 miles or so.Sorry to go but am just hoping somebody has come across this before and can advise.At the moment I can only guess fault is in the rack.There is no play in steering components or .suspension.Thanks to anyone reading this in the first place.and any replies are greatly appreciated..Even to sell the car..Only has 45000 miles on is in excellent condition.Is the 2litre automatic..Thanks again.