Major Problem- some advice appreciated

[ova50]

If I were you I would be fitting that Scangauge ASAP. They are not that hard to work out. Fitting takes 2 minutes.

Put the scan guage in this morning, I did not bother setting the fuel info for mileage/distance etc.
Is it ok to do this at a later stage, or should it be done now.??
Scrolling through the guage I have found the usual things like rpm, voltage etc. Found one that reads, no codes found (i assume this is an important one) plus heaps of others.

Any advice as to what I should be looking for as far as the readings etc on the guage??
Any info is appreciated (except if is stuffed, wont appreciate that,lol) Should mention my Patrol is an auto.

I was also having a look around the engine this morning (not that I have a clue what I am looking for).

However I happened to wiggle this hose (attachment) and it quite loose, could have removed it without undoing the clamp. I figured this should be tight so done it up, now secure. ( clearly Nissan saying they have checked all hoses etc is pure crap and will will be nailing them when I see them)

I went for a short run and the smoke is still there but I dont think it is quite as bad. (unless its my brain playing tricks on my eyes).

I have spent most of the day documenting the conversations, dates etc, that I have had with the dealer.
Still all up in the air at the moment. (damm, Im starting to miss my old 4b)