Hi there

I have an A4 Avant 2022 with 125k kms and i now have to get a new Adblue sensor & tank as the car developed a fault last few months. Dealership told me to let it run until it wouldn't start again. Low and behold the car is out of warranty by 6 months and Audi will do nothing for me. Seems to be a well known problem. I've had the car since new and always had it serviced in Audi Sandyford. Really disappointing standards from Audi now set to cost me €2.5k.  Anyone else similar issues?

Edited December 9, 2025Dec 9 by Steven Lynch

Welcome Steven and sorry to hear of your issue. 
‘Seems to be a well known problem…’ I concur with that. 
Worth doing a forum search on ‘Adblue’ using Everywhere on the drop down menu. 
Stevey Y on here would be your man to give you sound advice on this.

Regards,

Gareth. 

2 hours ago, Steven Lynch said:

  Anyone else similar issues?

Many, many people suffer Adblue faults as you will see if you search the forum. It's a dreadful system.

5 hours ago, Steven Lynch said:

Hi there

I have an A4 Avant 2022 with 125k kms and i now have to get a new Adblue sensor & tank as the car developed a fault last few months. Dealership told me to let it run until it wouldn't start again. Low and behold the car is out of warranty by 6 months and Audi will do nothing for me. Seems to be a well known problem. I've had the car since new and always had it serviced in Audi Sandyford. Really disappointing standards from Audi now set to cost me €2.5k.  Anyone else similar issues?

Hi Steve, sorry to hear of your problem which is not unusual the system is badly designed, I am assuming its the level sensor that is the cause of your problem that is housed in the tank all other sensors/heating elements are in the pipework that runs from the tank, therefore if the tank is depleted get it refilled and at the same time get a level reset done by a VAG specialist as I have a theory thats why they asked you to run it down until it wont start, the wont start bit is activated when the Sensor realises there is not enough adblue, have you any fault codes to offer as that may give some illumination to the problem, as for customer service there is more chance of the Second Coming, if you use a VAG specialist even if you do get it replaced it will be cheaper.

Steve.