Road test the car and listen for a metallic clicking noise from the front while driving slowly in a circle with the steering on full-lock, repeating the test on both full left and full right lock. This noise may also be noticeable when pulling away from a standstill with the lock on. A clicking noise is a sign of outer constant velocity joints wear. If while accelerating, vibration that is consistent with the road speed is felt through the car, it may indicate wear in the CVJs (constant velocity joints) on the inside. If joints are worn or damaged, at present, there are only boot kits for this - the complete driveshaft then had to be renewed, with exchange driveshafts being available through a Volvo dealer or specialist.