Fiat Doblo Cargo goes to local mechanic as it cut out on the road and all electrics failed. Mechanic says ECU unit is required to the tune of £800. I say, "Erm no thanks" and arrange to uplift vehicle. Before I do he delivers vehicle, keys through door and drives off. Van looked at by another mechanic as not starting - turns out 1st Mechanic has taken out ECU unit and dumped it! Now I can't tell if it needs an "engine ECU (£423 + VAT + £50 due to old ECU not being returned to Fiat) or a "body ECU (£153 + VAT)works electric windows (didn't have any)".
How do I know which ECU unit it needs?
How do I know which ECU unit it needs?