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Can’t give specific advice but I’m sure Fruity (in your link) is right. With so many faults it’s likely to be bad earths. The ABS earth fault found certainly suggests this, though there may be supply problems as well. I would find and work methodically through the body and engine earths, unbolt, clean and reassemble. Then coat with Waxoil etc.

The main earths on the 156 are on the chassis rails behind and below the headlights, accessible from underneath; might be similar on the 147?

I’m not at all sure but it’s possible that the ecu disables the air con when you go to full throttle, to put all available power into the wheels. This might explain why the fault is throttle dependent, but I would still start with the earths then move on to the supply side if that doesn’t sort it.
 

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The battery needs to be above 14V for many hours (ie: fully charged) before that becomes a valid test, but if it was then yes, change it. (You are saying you had it disconnected overnight, to stop the car draining it?)

I tried searching for 147 earth positions, have a look here: Earth points

Posts 3 and 4. Unfortunately it doesn’t say which car, but that’s all I’ve found so far.
 
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