Mine is cold that cold i turn it off sometimes for a short time as i feel i need my coat on lol.

How long has it been using that amount.
The undertray will hold a lot before it drips.

Tyres.
You say fronts relatively new what tread is on the rears.

Excellent advice list there.

No codes no worries.
As said could just be a backlog of soot to clear out in the pipe.

Just looked ant is it the fault code scanning it does.

What does Bimmerlink do.
Got Bimmercode and just looked at Bimmerlink and it is £34.99 the same as code.

I paid £70 for both worth every penny even if you only use it occasionally if something goes wrong anytime you will always be able to scan and see what faults occurring on the spot mines plugged in constantly and regularly do a full scan to check or put dpf section on which shows all temps and dpf ...

I think they are pricing them selves out of the market.
Well for the likes of me who only want to use it 3 or 4 times a year.

Had carly 5 years ago it did what i wanted but at a hefty price after buying there obd dongle as well also got caught out with there auto renew. Needed to do some coding bits just of late but this time no way was i paying for carly so i went for bimmercode. The dongle was a lot less and a one off pa...

When i changed one i hung the door card on a bungy thingy to save unplugging everything.

Genuine every time on this part.
Sister fitted well my nephew fitted one from ebay and it worked until it got hot enough to melt.
Luckily it fell apart so stopped and didn't set on fire.

From what bit i remember reading of the update it was a farce.
As said above basically if it didn't come with them it's a fail.
But and i will have to look again it didn't include the main beam put what you want in there.
Will double check tomorrow.