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Many companies will guarantee the remote starter for as long as you own the vehicle. While the system is under a warranty, the remote itself is rarely warranted for more than a year or two, so find out what the remote replacement cost will be. A dealer cannot void a warranty if equipment is added. It is against the law. The dealer can however, void the warrant if the installation of the equipment causes any damage to the vehicle. A professional remote starter company and shop should be used to avoid any damage and void of your warranty.
Read the warranty information on both your vehicle and the remote starter system. Check with your current vehicle warranty information.