Hello and welcome to our web page here my name isXXXXX a Certified Volvo Car Expert Mechanic.I'm going to try to help you find the help you need
high speed vibration are most the time in tires and wheels
than also it can be drive shaft and engien mounts
and for alarm most the time is siren module but to confirm siren problem alarm problem you must use scanner to hook it up read error codes
but i would say vibration will be bad tires or bent rims so close up inspection needs to be done
thanks enes. the car has a 30 day all inclusive warranty and is going back next week for some final work and adjustments. I will use your comments to guide me. Will let you know how it turns out and finalize your payment.
Is the problem is engine mounts or drive shaft, is that an expensive issue? Can you estimate what it might cost?
hi Enes. you have not answered my last question. Perhaps you missed it.