Worst case scenario : the ACU is dead....resetting will not help because the errors return,
Yes, I'm suspecting the ACU as well, because of the "01 - Control unit faulty" message (though oddly enough this error is listed as "intermittent", although it returned pretty much immediately when I tried to clear the error codes, which I tried to do several times).
Or clockspring in the steering wheel is broken.
Now, that sounds interesting, because for some reason, the horn doesn't work, in fact the previous owner has mounted a switch beside the steering wheel, just below the left (indicator) stalk. I've often wondered why that was done... Is it difficult/expensive to fix/replace the clockspring?
btw are you sure there is no passengers airbag ? all 156's I know have at least 2 airbags.
I'm pretty sure. On the passenger side you can normally see the outline of the airbag compartment (or whatever you call it) in the dashboard, but on this car it's not there, and there's no lock to turn the passenger side airbag on and off, either. Besides, I'm pretty sure the sticker on the driver's side window says something along the lines of "Airbag, driver's side", and as per my screenshot above MultiEcuScan says "Driver" for the parameter "Airbag configuration".
Despite being a 2.0 TS, I don't think this particular car is a very high-spec one, and it's one of the earliest 156 models (ePer says it's built in October 1997).
there is also a sensor pad in the passenger seat that can break.....
Isn't that used to determine whether to set off the passenger airbag in the event of a crash (I think that's the purpose of the "occupant classification sensor" in the passenger seat of my Fiat Stilo, for instance)? If so, it shouldn't be needed if the car only has one airbag?