If your air compressor is working all you have is a air leak in a air shock. You can buy one on line for about $80. Very easy to replace. Jack up one side of the car, take air hose loose by twisting and pulling, take out pin and top and lift up from bottom. Replace with new one. You may be able to tell which one is leaking because that side will be lower. If you only replace one the other one will start leaking in a few months.