Have you bought a new pair of ignition coils? Often when the ECU goes wrong it damages the coils, they're not very expensive (& might save you damaging the replacement ECU). You could get new keys cut but they will need the transponder coding. or you could CAREFULLY cut out the transponder chip from the new key. IF you can use the ECU/code box that you bought you could just tape one of your old keys inside the steering column cover but that will mean the car isn't immobilised. I don't know what code box & wiring loom you have in your car. Notice also the plus sign to access the comparator tool where you can compare up to 3 cars at once side by side. This shows the standard Seicento M1/M7 code box Fiat Seicento Specs Petrol Engines (13 Versions) Choose a Fiat Seicento version from the list below to get information about engine specs, horsepower, CO2 emissions, fuel consumption, dimensions, tires size, weight and many other facts. The code box, it's connectors, & the loom are also different so you can't just plug in a different system. So a (more modern) HW305 code box cannot understand an unlock signal from a IAW 59F.M2 (HW002) ECU. As far as i understand it the HW is the processor and memory type -it needs to be the same for the ECU & code reader so they can communicate.
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