AdBlue - VCDS - Reducing Agent tank volume

[Lannust]

I bought a 2019 T6 102 Startline van in Jan 2022. The AdBlue range at the time was 6000 or 6500miles, I can't exactly remember. Having driven 3300miles, the AdBlue range is now 4500miles and has just added the message that I can top up with a min and max of 0.75gallon AdBlue. As a low mileage user, I was going to carry on using up what was in the AdBlue tank until I can get 10 litres in, or perhaps just 5l to keep it fresher by using each top-up quicker.

Anyway, the real reason for posting is to ask for some help. Please would someone with more experience be able 'translate' some of the AdBlue relevant lines in three VCDS 01-engine block map scans from the last 10 months -
17/01/22
IDE10247 Reducing agent tank volume: act. value calculated 15.648 l
IDE10249 Reducing agent fill level sensor: act. value 118 mm
IDE10032 Reducing agent quality sensor: urea concentration 0 %
IDE10039 Reducing agent quality sensor: validity invalid
23/06/22
IDE10247 Reducing agent tank volume: act. value calculated 13.089 l
IDE10249 Reducing agent fill level sensor: act. value 101 mm
IDE10032 Reducing agent quality sensor: urea concentration 0 %
IDE10039 Reducing agent quality sensor: validity invalid
24/10/22
IDE10247 Reducing agent tank volume: act. value calculated 11.619 l
IDE10249 Reducing agent fill level sensor: act. value 92 mm
IDE10032 Reducing agent quality sensor: urea concentration 0 %
IDE10039 Reducing agent quality sensor: validity invalid

IDE10247 - Is this the calculated volume of remaining AdBlue?
IDE10249 - Understandable, this is getting lower as the AdBlue is used. I appear to have used 26mm of AdBlue over the last 3300 miles, with 92mm left in the tank that seems like a lot of miles worth at my current rate of use. I'm surprised to be getting a message that I could top up this early.
IDE10032 - This is somewhat concerning along with IDE10039

What do other people see on these lines?
Any thoughts and suggestions gratefully received.
Alternatively, could someone point me in the right direction to find the meanings of the IDE lines created in in any module block map scans. Is there information available that gives expected results or ranges?

I feel I am flying blind when running VCDS on the T6 with its massive changes/increases in electronics technology compared to my old T4 TDI that had detailed information available in manuals or would pop up with an 'expected result/figure/number' when hovering the mouse pointer over a live data block once I had created my own version of the VCDS 'Label File' for my T4 engine.

Cheers
Simon

 

[Bigsidavies]

Sounds about right to me. The miles remaining does tend to fluctuate both up and down.
I normally wait until it asks for 0.75-1.0 gal and stick 3 litres in at the pump.
Shell have recently made the minimum delivery 5 litres, but Texaco near me is 2 litres I discovered last week.

Can’t comment on the VCDS stuff as I’ve never looked into it in that detail. If it’s not throwing any fault codes then I’m not interested.

 

[mmi]

IDE10032 - This is somewhat concerning along with IDE10039

Some observations about IDE10032 and IDE10039 here:

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IDE10249 - Understandable, this is getting lower as the AdBlue is used.

I have recorded maximum of 136 mm. On the other end have seen 42 mm when remaining range was 1000 km (600 miles). Thus I would expect zero range be somewhere in 30-35 mm of IDE10249.