Many of the newer vehicles on the road today may require a factory security integration module which is designed to allow the remote starter to work with the factory security in your vehicle by "bypassing the chip in your key". Beginning around 1996-98 some cars began coming with anti-theft systems which included a immobilizer chip within the key. This system prevented the car from starting unless the right key, with the correct chip in the ignition. In the last few years most (but not all) vehicles have these anti-theft systems. Obviously, when you install a remote start on these vehicles, the car isn't going to start unless you trick the car into thinking it "sees" the right key in the ignition with the right "electronic code" in its circuitry. This is done with devices called ignition immobilizer bypass module. These specialized module and their installation are required for the remote start to work in these vehicles. This is added to the cost of the remote start.