It depends on the type of spy device and the vehicle manufacturer. The portable Micro Tracker will not affect the warranty. However, the Hardwire Tracker and kill switch may affect the warranty. We recommend consulting a professional to install the Hardwire Tracker and kill switch. Dash cams that plug into the cigarette lighter won't affect the warranty as well as battery powered dash cams. It is dependent on the manufacturer of the vehicle so it is recommended to consult with the manufacturer before placing any wired device inside the vehicle.