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I’m not an expert but I know that different digital systems in the same equipment will drop out at different times, depending on how fussy they are and the power supply design. Makes sense that the ecu would be more resilient than the dash.
I used to drive an electric vehicle at work that would happily (not happily) carry on driving whilst the dash flickered on and off in time to the turn signals.
On fuel injected car, the fuel injection needs to be powered before the car will start. That is before the starter motor is engaged. Seems counter intuitive.
My panda experience has been replacing the rear suspension beam with one from a Ford KA. Also looking at the power steering motor replacement and how to get it to work.
There is some free FiatOBD software out there.