Thanks. More info coming in ;)

http://www.xoutpost.com/bmw-sav-foru...blue-code.html

The fun starts at page #2

If they are replacing it, can you take the old tank? It would be cool to have a broken tank to do the external temp sensor idea and install it to see if it works.
Someone needs to be the leader in this and do the sensor :) I wish i was electrically capable cuz i'd do it. I can do mechanical things but none of that resistors and tricking the system stuff :/

Here is a OEM active tank wiring harness that can be used maybe?

I'll try to get the tank, but they may try to repair and reuse it.

Here is an article that talks about the DEF System and how it works.

Had an interesting DEF issue arise yesterday. Out of the blue got an 'incorrect fluid' warning, with 200 miles to no-start, and a 'check engine' light. Naturally, I was well over 200 miles from home or a BMW dealer in the middle of the Sierra Nevadas. The car has not been in for service for almost a year, in fact it is due for one; I topped off the DEF thinking it may just be low, but the countdown persisted for another ~75 miles, then disappeared. 'Check engine' light is still on.

In our 11 35d we've had both tanks replaced in the last 6 months. Active and passive, as well as just now the HPFP threw a code so they replaced that. Luckily under warranty still until May 2016! SA told me that they're getting close to extending the warranty on all the diesel emissions related stuff. Now that the VW fiasco has come to fruition, they expect BMW to be on top of this big time now. The EPA will wreak havoc if another one of these manufacturers has recurring diesel emissions issues.

Also, I have a friend/client here in Denver who's successfully been involved in several manufacturer class action lawsuits, on the plaintiff (our) side. He told me I'd need two more guys (to make it a class) and they'd be all over BMW NA in a heart beat. These are the guys who were part of the Firestone tire case, the Toyota gas pedal case, the air bag case(s) etc. Big litigation firm who thrives on this stuff and does a lot to keep these companies honest. Believe it or not, most really try to cheat the EPA guidelines and think if just a small % of owners have an issue, it's easier to deal them as needed and hope they go away.

^ Heck, you can get more than 2 people just from this board. Sign me up lol
Whats the info, any links? I would love to have this covered by BMW if i can. Cant even pass stupid inspection cuz this light keeps poping up for me after i clear it.

My car is on its fourth active tank, first failure was under previous owner. I had it replaced twice under parts/labor warranty, it seems to last just under two years. A tank costs 800+ and not sure where the other 1200 come from, the OP quotes 2k? Each time car is in for two days to get it fixed. I can't believe there is a wait of several weeks involved....

I happened to be at my local BMW Dealer Parts Department today picking up an online order. The parts guys are VERY good at this facility and I have been dealing with them for a number of years.

I happened to make some comments about the DEF tank issues and I was speculating that there may even be a Warranty Extension on these at some point. One of the guys mentioned some of the tanks are on "National Back Order" at this point. He was even shaking his head with no idea on delivery time frame.

I also think the $1200 in question is about 1/4 to make up list parts price and the rest is labor as I think this tank is not quick to replace.

This means a few things to me:

A. The failure rate is higher than expected and there is not sufficient projected spare parts inventory to keep up with the failures/demand.

B. The failure rate is higher than expected and the failures are being addressed with a revision or redesign delaying current availability.

C. The failure rate is higher than expected and the supplier is unable to keep up with assemblies for both new builds and field/in service repairs.

D. Everyone is generally screwed because the failures are on the uphill side and they will continue to snowball as these vehicles continue to age.

E. The critical mass of failures is not quite high enough to have 3rd parties come up with a cost effective solution with repaired cores available for purchase and exchange.

F. As much as BMW would like to come up with some overall software improvement to make this less of a customer annoyance, I think the VW debacle just killed any hope or idea of this ever happening.

I just do not see this story ending well anytime in the near future.

Good luck to all Diesel owners and their DEF systems.