35D DEF Tank Level Sensor Issue

[bawareca]

Passive tank failures are very rare. There is only 1 sensor inside.
Once we find a solution for adding external active tank temp sensor replace rate will go down 60-70% from whom is interested in DIY. Level sensor failures, like OPs, are much rare. But there must be a way to emulate this signal.
Last resort would be to disable the DEF in DDE(VW did it in a corporate level ) or disable the DEF related codes. These solution will come soon as more and more diesels are going out of warranty and there will be a real demand. In the same way as replacing the dreaded N62 coolant transfer pipe was $6-8k years ago and now is offered for under a grand in many places.

[jfoj]

Originally Posted by bawareca

Passive tank failures are very rare. There is only 1 sensor inside.
Once we find a solution for adding external active tank temp sensor replace rate will go down 60-70% from whom is interested in DIY. Level sensor failures, like OPs, are much rare. But there must be a way to emulate this signal.
Last resort would be to disable the DEF in DDE(VW did it in a corporate level ) or disable the DEF related codes. These solution will come soon as more and more diesels are going out of warranty and there will be a real demand. In the same way as replacing the dreaded N62 coolant transfer pipe was $6-8k years ago and now is offered for under a grand in many places.

I proactively installed a Bimmer Fix | Coolant Pipe Repair System coolant sleeve in my N62 when I replaced the water pump a few weeks ago for $200.

So hopefully I will not have to deal with a leaking coolant transfer pipe in my N62 during my ownership!

But there seems like a market will quickly pop up for DEF tank solutions.

Is there a transfer pump between the passive and active tank? I did not see one listed, but I did not spend a lot of time looking at the system since I do not have a Diesel. But I was just curious as to what/how the temp sensor functions and if there was a work around other than replacing the entire tank at great expense.

[johnmn]

Originally Posted by bawareca

Passive tank failures are very rare. There is only 1 sensor inside.

And... mine failed (passive tank level sensor). When the tank is full I get no CEL. When the tank is low I get a CEL.

Member PIXLFIX over on Bimmerfest repaired their failed active tank level sensor by adding resistance between the two leads of the sensor. I will likely do the same if I can't find a cheap secondhand tank or sensor to swap in.

[bawareca]

Originally Posted by johnmn

And... mine failed (passive tank level sensor). When the tank is full I get no CEL. When the tank is low I get a CEL.

Member PIXLFIX over on Bimmerfest repaired their failed active tank level sensor by adding resistance between the two leads of the sensor. I will likely do the same if I can't find a cheap secondhand tank or sensor to swap in.

Thanks. More info coming in