How do Immobilizer with transponder work?

An immobilizer with a transponder is a security system used in vehicles to prevent unauthorized starting. When the key is inserted into the ignition, the transponder chip within the key emits a unique code. The car's immobilizer system reads this code; if it matches the stored code in the vehicle's computer, the engine is allowed to start. If the code is incorrect or absent, the immobilizer disables the engine, preventing it from starting.