Technical Injector circuit malfunction

[Ciccioformaggio]

I have some problems with electronics. The last one was P0204 code error (Cylinder 4 Injector Circuit Malfunction); two months ago I changed the entire injection cabling. What do you think ??
:bang:

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Fiat Croma 1.9 Mj (2006) Emotion

 

[Hellcat]

Why did you change the injector cabling before?