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The car cannot be started due to the anti-theft system, because of the immobilizer system your car will think that you are a thief trying to steal it, the security system or the anti-theft system, the function of this system is to protect the car from theft, as the security system prevents the car from starting with a key that is not programmed for the car, which forced car manufacturers to invent the immobilizer system or the security system to protect cars from the phenomenon of theft that spread during that period. Financial support link / @alrayan_car Components of the immobilizer system and its working principle, the immobilizer system consists of three basic elements, which are the chip or code or the magnetic chip located inside the car key cover, as this chip or chip contains a PIN code stored inside it, and the second element is the reader or sensor, this sensor is located around the switch or near the place where the key is inserted, and the function of this sensor is to read the PIN code stored on the chip or chip located inside the key, and send it to the car computer or the car control unit, as for the third element, it is the car computer, as the car computer also contains a PIN code or code, so when the car computer By receiving the encrypted code, it compares it with the code stored inside it. If the codes match, the car computer will allow the car to start. However, if the codes do not match, the car computer will hinder the car's operation. Here, the car computer thinks that you are a thief trying to start the car, so the car computer cuts off the electricity to the fuel pump and injectors, or cuts off the electricity to the motor, the dissipator, or the spark generator, and thus the electricity will be cut off to the spark plugs or spark plugs. Symptoms of an immobilizer system malfunction: In the event of any malfunction or malfunction in the immobilizer system or the security system, a signal will appear on the car's dashboard or on the dash board. This signal is usually in the form of a key. If one of these signals appears, do not tamper with the car, because the car cannot be started until the immobilizer system is verified and reprogrammed. Causes of an immobilizer system malfunction: Loss of the chip or the magnetic chip inside the key, damage to the chip due to exposure to high temperatures, knocks, or another magnetic field Or maybe the sensor is damaged, or maybe the PIN code stored inside the car computer is lost, especially in Korean cars, and the reason, my friend, is the constant weakness of the car battery or overdoing it in replacing the battery. My dear friend, please visit my channel and subscribe to it. With the compliments of your car with Al-Rayyan Ibrahim Ayyad