CV Joints can only be serviced by qualified technicians. We suggest you get in contact with your nearest service centre to get your cv joints inspected.
Signs of CV Joints needing replacing
Vibration while driving
Grease on the inside or edge of the wheel
Knocking or clicking sound when turning
CV Joint boot broken or damaged
You will have a cv joint for each wheel. So if you have an all wheel drive vehicle you will have 4 cv joints.