Daewoo Lanos starter problem 1.4

Hi friend, it's logical that the speed sensor isn't working. You have to check it thoroughly. In the Lanos, it's very common for the sensor to fail, but keep in mind that it's also very common for the speedometer pinion to fail because it's made of plastic. It's necessary to check the pinion first before buying the sensor. The pinion is where the sensor screws in. Or you have to retrieve the fault codes.

Okay, so I'll tell you how things are going with my car.
I took it to the official Daewoo dealership, and after several days, they called me saying they'd scanned it and it showed an immobilizer fault. I told them to fix it, and a few days later they said they'd installed the immobilizer, and the car started for about twenty minutes before shutting off again. Now they're saying it's the ECU that's faulty, that it needs to be replaced, and that the part alone costs over 900 euros.
They asked if I could get a used one and they'd install it for me.
I'm really confused because I don't know what to do. I hope you can guide me on the best course of action because I think the repair will cost over 1,500 euros.
I want to thank you all for your advice and for your concern about my problem.
Regards... jomadu

If you get one in Desgaja you can program it or you can condemn the address of someone who eliminates the immobilisator so that it never passes again.