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      02-08-2026, 09:23 AM   #1
fooliojp
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G31 520d - How to replace Ad-blue (DEF) tank?

Hi All,

I've got a faulty Ad-blue tank sensor, anyone know how to remove or replace this tank? Any advice would be much appreciated.

Care details are 2017 520d G31.

Thanks again
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      02-20-2026, 06:35 PM   #2
embi
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Tank should be visible from underneath of the vehicle. Check the wiring to the sensor first.
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      02-26-2026, 01:30 AM   #3
bepp67
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Quote:
Originally Posted by fooliojp View Post
Hi All,

I've got a faulty Ad-blue tank sensor, anyone know how to remove or replace this tank? Any advice would be much appreciated.

Care details are 2017 520d G31.

Thanks again
Hi, here is the guide to remove the scr tank
Attached Images
File Type: pdf Removing and installing the passive tank SCR.pdf (2.39 MB, 10 views)
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      03-21-2026, 09:45 AM   #4
fooliojp
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Quote:
Originally Posted by bepp67 View Post
Hi, here is the guide to remove the scr tank
Hi Bepp67,

Sorry for the belated reply! Just seen this and it just so happens yesterday I took delivery of my used SCR/DEF/Adblue tank for my G31.

Really appreciate the instructions

I also found this YouTube video... The video title is a bit confusing but its comments confirm it works for a G31 as well.



Disconnecting the pipes appear to be the tricky part especially if you trying it from under the car.

Thanks again Bepp67!
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      03-21-2026, 09:53 AM   #5
fooliojp
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Quote:
Originally Posted by embi View Post
Tank should be visible from underneath of the vehicle. Check the wiring to the sensor first.
Cheers Embi

Do you mean the SCR module?
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      03-24-2026, 12:31 AM   #6
bepp67
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Quote:
Originally Posted by fooliojp View Post
Hi Bepp67,

Sorry for the belated reply! Just seen this and it just so happens yesterday I took delivery of my used SCR/DEF/Adblue tank for my G31.

Really appreciate the instructions

I also found this YouTube video... The video title is a bit confusing but its comments confirm it works for a G31 as well.



Disconnecting the pipes appear to be the tricky part especially if you trying it from under the car.

Thanks again Bepp67!
It was nothing, don't mention it
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