I'm guessing that is a garage job?
if you are not confident with wielding spanners then i would advise for you to take it to your trusted garage
Test both the 159 and Brera (when it was working) today and all readings match those ranges you advised.
kinda what i expected, but did the 159 show any fluctuating mV readings @0% throttle on Track 1? (as track 2 was showing for brera, in your attached excel file)
Today (albeit briefly) I managed to clear the P0101, P0111 errors so took some readings...
Intake air quantity: 0.0 mg/i
Desired intake air quantity: 1199.5 mg/i
Intake air quantity signal period: 0.533 ms
Air temperature (MAF): 1.16 °C
Within minutes it failed to read again.
So, yet again, what could be causing these unstable alerts (when the car has not moved!)?
I'd only expect this to show, with regards to the below points, with engine running:-
Inspect for any vacuum leaks downstream of the MAF sensor.
'Inspect for a restriction in the induction system or the exhaust system.' this to me would kinda point to the swirl flaps in the intake manifold being forced shut...(P0101 Trouble Code - Mass Air Flow (MAF) Circuit Range/Performance Problem
if its showing at ign on eng off, id suspect gremlins or a failing/failed MAF
This is a pretty simple code and it only really looks for extremely quick changes that are relatively high in voltage. apparently It's usually the sensor that is bad unless the vehicle is extremely old, in which case there may be harness problems.
P0101 coupled with P0111 to me points to a failed MAF as the ambient temp sensor and MAF sensor are in the same unit.
all of this could also be a dicky relay... I don't know what relay controls which systems so it might be better to hope someone else can help... as said I'm a little green with Alfas at the moment. Sorry if I'm not being helpfull