This applies to all cars, not only VW.
Does it feel like your car is vibrating when you drive at speed?
Did this start happening after you power wash / jet washed the car?
This happened to me too. The problem is caused by either one of two things, both of which unbalance the wheel rim(s) – you need to check the front wheels first: The first one is most likely.
- you have dislodged a load of mud / gunk from the wheelwell and it has gone into the back of the wheel rim where it has solidified. This is more likely with alloy wheels since they are usually deep and flat on the inside rim. To check for this, remove a front wheel (front causes vibration more than rear when out of balance). After the wheel is off, turn it so you can inspect the inside of the rim. Scrape the inside of the rim with a coin etc. If there is more then 1mm thickness of dust/mud caked on, scrape it off. You need to check around the entire rim since it may be only in one spot. Clean the entire rim. Check at least the front two wheels.
- alternately, you may have knocked a lead wheel weight off; on alloy wheels these are simply lead tape which is glued inside the wheel rim . It is possible to blast it off if you are over zealous with the jet wash. Look too see if there is a cleaner area similar to the shape of the other weights. If this is the case you will need to have the wheel re-balanced at a workshop (unless you find the weight on the ground, in which case, stick it back with glue).
Please feedback if this helps you.