The quarter panel on a vehicle is very much like the front fenders on the other end. You need to remove this panel from the car if you need to repair any body damage to it, or if you need to replace the panel altogether. There are a number of other components that you must remove and get around in order to remove the panel. This general process can vary depending on the exact type and model you are working on.
Raise the vehicle's rear end and support it on jack stands. This is especially needed if the vehicle has a low clearance.
Open the car boot and the rear door.
Disconnect the electrical connectors for the tail light that is connected to the panel; the connectors are in the back of the tail light housing. Remove the mounting bolts for the tail light housing with a wrench and remove the housing.
Remove the fasteners for the splash shields in the fender well and remove the shields. These fasteners can require a standard, Allen or torx wrench depending on the model.
Detach all the screws and pins holding the rear bumper cover in place with a screwdriver and pliers, then remove the bumper cover.
Remove all the mounting bolts for the quarter panel with your wrench; these bolts can be found behind the splash shields, along the door frame and along the boot frame.
Lift the quarter panel off the car. If it does not come off easily, there is at least one bolt still fastened. Do not try to force the panel off.