Question: Is there really a circuit in the active tank for sensing the temperature of the DEF or is the computer cleverly interpreting the ohm values of the 10k resistors with temp variation? INPA readout shows -4.17 degC.

On Monday wife tells me the yellow "water tap" light is on and picks me up from the airport in the Tundra. Hooked it up to INPA yesterday morning and read codes (jet lag is a wonderful thing....). Then I read a long thread on B'fest and one thing does not become clear to me as per the above question.

The active tank was replaced at least once on my car and I am not sure if it was replaced a second time, gotta find the records. In the mean time sent an inquiry to an SA in Fairfax to see if there is a warranty on these dang tanks.

If no warranty or goodwill from BMW then I might send it to Toronto to be fixed. They provide a lifetime warranty and that seems attracive since I don't feel like having this problem every two tears.

__________________
2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.