The obd2 port on a 159 looks like a scart lead TV. Goes below the fuse box on the right hand side as your driving position. Under the fog light switches there is a cross head screw undo this and if flip down ,your see the obd2 socket below all that fuses be gentle with it.
Hope this helps only found mine the other day with help from some kind sole on here.
I can at least answer where they plug in. As you are sat in the drivers seat, there is a little cubby hole on the bottom right of the steering wheel. Below that is a panel next to the door held in by 2 screws and you plug it into there. When you take the 2 screws out, be careful as the bottom of the flap is on hinges which can break.
I've got a wifi one so I can't comment on those cables.
Just got my first chance to have a go with multiecuscan and got P0013 and P0014 error codes. See images attached.
Anyone got any ideas if these are flagging issues with my engine or just dodgy sensors? P0013 sounds ok, but P0014 is telling me to take action. Is it a coincidence they're both faults around the intake? Generally with engineering I don't believe in coincidences.
EDIT: I should also mention that the engine warning light hasn't been lit for the last 2 days, but the ECU cables were already in the post...