Knocking noises going over bumps can be caused by worn sway bar end links. These end links have small ball joints that become loose and rattle. Replacement is the only fix.
Problems for specific Volvo C70 years:
Car problem reports
Problem with your car? See what our experts say or submit your own.
Most reported 2009 Volvo C70 problems
Front upper strut mounts may wear prematurely, resulting in loud noise from the front of the vehicle when going over bumps.
The upper engine mount may wear prematurely. Symptoms may include a harsh feeling when the transmission is shifting and roughness when the engine is idling. Worn engine mounts should be replaced as necessary.