Ad blue warning - can anyone give any pointers on the analysed data?

[Pegsoid342]

I left the van with a local garage who couldn’t promise they could do anything and I didn’t think they would. Incredibly we phoned this morning and monsieur said he’d sorted it. From what I can gather he had reset the ad-blue system (possibly ecu). Now showing 6500 miles. Can get in with our holiday now. Well happy!

 

[Ayjay]

Hopefully that will at least be OK until you're this side the channel but don't be surprised if the '650 and counting down' warning comes back (I'm not without experience of it!). Do you know what Monsieur le Mécanicien actually did to reset it?

 

[Dundee_Kev]

Pretty sure It will pop back on after a few miles are drivien. Just had an Audi A6 in with the countdown. Needs a new tank, but did a full reset and sent him on his way. Only to get a call a day or two later saying it's back on. It's coming back for another reset and then off it goes to be traded in for a Toyota chr hybrid.

Should be more reliable!

 

[Lucasimo]

Out of interest, how much fuel do you have in your tank? Sometimes the simplest solutions are overlooked?!!

So pretty much a half full fuel tank at present...

 

[Lucasimo]

On the subject of these Adblue things, I'm going to take a look inside the new tank when I get hold of it just to see what it's like in there. If the pump has a fair amount of dried urea deposits on it inside, then I'll clean it off well with water first and then put it back on the tank. Then I'll install the new tank and put exactly 5L of Adblue inside it just to start it off.

New tank being delivered by DPD tomorrow so hopefully I can fit it on Thursday evening and maybe finish off on Friday evening. I want to get at least the new tank connected up on the van and confirmed as all working before putting on the plastic undertray pieces. Once I know it's working ok, I'll then add another 5L and leave it at that.

I don't have a lift or a support for making it easier taking the old tank off, so I'll use a sturdy cardboard box to hold it. Seemed to work reasonably well last time.

The driveway will inevitably look like someone has done a massive piss as a result of some spilled urea - but at least it can be cleaned easily with water.

 

[Lucasimo]

Pretty sure It will pop back on after a few miles are drivien. Just had an Audi A6 in with the countdown. Needs a new tank, but did a full reset and sent him on his way. Only to get a call a day or two later saying it's back on. It's coming back for another reset and then off it goes to be traded in for a Toyota chr hybrid.

Should be more reliable!

Yeah. VW really messed up with their Adblue system here. It really didn't have to be as fussy and prone to faults as it is.

 

[Lucasimo]

So here's an update.

New pump and tank arrived this afternoon. Van on axle stands, old tank removed. New tank put on and everything connected up. 10L in total of Adblue put into the empty tank.

Stupid warning came on again.

Then I realised that the Adblue tank and pump didn't actually come supplied with the Adblue controller. So I contacted the supplier and they are sending the controller to me for a tenner (it was a separate advert that I didn't see on eBay). Ill fit this easily enough as it can be fitted without the hassle of removing the tank again.

Went into VCDS and did all the SCR reset functions which said that they said they worked. But still that stupid bottle light came on. I actually think it needs to be driven for a while on a journey to force it to recalibrate or something like that. Counter is still at 450 miles to go before no engine start.

So for now, I'm going to just drive the van normally and it might then behave itself randomly. It's 120 miles to Kelmarsh where I am next taking the van. So that's 240 miles in total which is below the 450 mile range indicator. I have the van booked in for the crankshaft oil seal on 1st Sept so I'll ask them to check it out if I'm still getting issues.

F*** U VW for making such an appalling Adblue system

 

[Howzat]

So how much did all the parts set you back?

 

[Sasquatch]

It really didn't have to be as fussy and prone to faults as it is.

How would they make a profit if people like you didn't part with £££s of pounds on parts that cost £40 to manuracture if they were reliable?

 

[Lucasimo]

So how much did all the parts set you back?

so far its been £200 for the tank and pump and then another £10 for the controller. Irritating - but not a huge expenditure as such. At least I have the tools here and the driveway space to work on the van.

 

[Sasquatch]

so far its been £200 for the tank and pump and then another £10 for the controller. Irritating - but not a huge expenditure as such. At least I have the tools here and the driveway space to work on the van.

That's actually not bad. Peugeot charge well north of a grand for a typical combined tank/pump assembly.

 

[Lucasimo]

Interesting to see that this time the dash displayed the Adblue range remaining at 450 miles - but then showed two indications as follows:

MAX0_ 75G

MIN0_ 75G

It has never showed these second two bits of information before. So maybe it is actually trying to recalibrate or something like that. So maybe - just maybe with new controller fitted on Monday evening and then taking it for a drive - it might start behaving itself.

 

[Lucasimo]

That's actually not bad. Peugeot charge well north of a grand for a typical combined tank/pump assembly.

yeah - it was a pump and tank from a decent breakers on eBay. The pump on this tank works fine and nothing suggests otherwise when I ran some tests in VCDS. So I think this part is OK. It could well be something up with the Adblue controller itself. Wiring looks absolutely fine up there. Very clean in fact.

 

[Sasquatch]

Ah, used. Even so, if it works that's a decent price. Fingers crossed.

 

[Lucasimo]

Ah, used. Even so, if it works that's a decent price. Fingers crossed.

Yeah - it all seems to be working OK. No odd readings or fault codes yet from the pump. Van is still on Axle stands until Monday when I will fit the new controller. Something does seem to be working correctly since it knows on the dash now that the tank has Adblue in it since the min and max indicators are now appearing. So I'm sure it is almost fixed now.

What I am also wondering is if it gets to zero miles on the dash warning can I then use the reset SCR lock function in VCDS to force it to reset itself? I wonder if it needs to be below a certain range for the SCR lock to actually be reset since I tried that function on VCDS and it said it worked but the warning still came on again.

 

[mmi]

What I am also wondering is if it gets to zero miles on the dash warning can I then use the reset SCR lock function in VCDS to force it to reset itself? I wonder if it needs to be below a certain range for the SCR lock to actually be reset since I tried that function on VCDS and it said it worked but the warning still came on again.

On Ross-Tech Forum has been stated the reset would give 50 km range - thus the engine can be restarted and kept running. Also it has been assumed it can be reset again to get another restart. That might explain why there seems to be no change at the moment.

I actually think it needs to be driven for a while on a journey to force it to recalibrate or something like that.

That's my thought, too. E.g. the self-resets/self-clearings seem to happen after some driving - so possibly the system somehow has just recovered somewhat to pass ECU's self-diagnostic.

For reference/experimenting some VCDS threads on another forum (note: T6 ECUs are UDS controllers)

3.0L_TDI CATA | CNRB - Testing SCR Injector and SCR Adaptation resetting

N474-Reducing Agent Injector testing and Adaptation of Reduction Agent resetting Hello, The following Ross-Tech forum posts outline the VCDS procedures for: Generation 1 Audi Q7 (4LB_NAR) - MY 2009-2012 V6 3.0L TDI 225hp - CATA Generation 1 TDI (2/2009 - 5/2012) [non-UDS] Volkswagen...

forums.ross-tech.com

I'm doubtful if resetiing AdBlue sensor fill level detection actually will resolve anything on T6 because of the newer generation sensor. The sensor have no difficulties to read tank level properly even when "overfilled". However, the overfill issue was a real thing with older type of sensors over 10 years ago - with a sensor inside the tank.

Post in thread 'AdBlue Refill Query'

19 Jul 2021

Fill whatever volume you like.
This fake stories about overfilling Adblue must stop eventually.

EDIT:
Who told you that you can overfill?

But isn't it actually a cunning way to lay the blame on the customer...

Actually, on early AdBlue systems (e.g Passat, Sharan up to approx. MY14) you indeed could reproduce the fault by "overfilling". However, the system was not as sophisticated as ours. More about the ancient system on pages 26 & 34-36 in VAG SSP 424 – Exhaust Gas Aftertreatment System Selective Catalytic Reduction – PDF Download (published in 2009).

• mmi

• 

 

[Lucasimo]

On Ross-Tech Forum has been stated the reset would give 50 km range - thus the engine can be restarted and kept running. Also it has been assumed it can be reset again to get another restart. That might explain why there seems to be no change at the moment.


That's my thought, too. E.g. the self-resets/self-clearings seem to happen after some driving - so possibly the system somehow has just recovered somewhat to pass ECU's self-diagnostic.

For reference/experimenting some VCDS threads on another forum (note: T6 ECUs are UDS controllers)

3.0L_TDI CATA | CNRB - Testing SCR Injector and SCR Adaptation resetting

N474-Reducing Agent Injector testing and Adaptation of Reduction Agent resetting Hello, The following Ross-Tech forum posts outline the VCDS procedures for: Generation 1 Audi Q7 (4LB_NAR) - MY 2009-2012 V6 3.0L TDI 225hp - CATA Generation 1 TDI (2/2009 - 5/2012) [non-UDS] Volkswagen...

forums.ross-tech.com

I'm doubtful if resetiing AdBlue sensor fill level detection actually will resolve anything on T6 because of the newer generation sensor. The sensor have no difficulties to read tank level properly even when "overfilled". However, the overfill issue was a real thing with older type of sensors over 10 years ago - with a sensor inside the tank.

Post in thread 'AdBlue Refill Query'

19 Jul 2021

Fill whatever volume you like.
This fake stories about overfilling Adblue must stop eventually.

EDIT:
Who told you that you can overfill?

But isn't it actually a cunning way to lay the blame on the customer...

Actually, on early AdBlue systems (e.g Passat, Sharan up to approx. MY14) you indeed could reproduce the fault by "overfilling". However, the system was not as sophisticated as ours. More about the ancient system on pages 26 & 34-36 in VAG SSP 424 – Exhaust Gas Aftertreatment System Selective Catalytic Reduction – PDF Download (published in 2009).

• mmi

• 

 

[Lucasimo]

Very interesting to read this. I'm thinking a few drives should kick it back into a working state. When I go to Kelmarsh, I'll certainly be taking my laptop with me along with my VCDS cable just in case I need to use it! Many thanks as well for your assistance in helping to fix this annoying issue. I am hopeful it will all be fine soon enough. New Adblue control module arrives in the next few days so I'll put it on and see how it goes.

 

[Pegsoid342]

Hopefully that will at least be OK until you're this side the channel but don't be surprised if the '650 and counting down' warning comes back (I'm not without experience of it!). Do you know what Monsieur le Mécanicien actually did to reset it?

Haven’t got a clue. They couldn’t guarantee won’t be problematic again but if I get the 650 warning again it’ll be enough to get me home. Have done a few small journeys since and it’s still all good. Head home tomorrow with 2 overnight stops so

 

[Lucasimo]

So - another update on the Adblue mission.

Fitted the new Adblue controller today. Still had the annoying bottle symbol appear.

Took van on a 18 mile drive to M4 Eastbound J17 services. Did a scan and this P218F fault came up. I'm not fussed about the occasional appearance of the EGR fault as this is known already several months before the Adblue fault was an issue. The P218F appeared when the engine wasn't running which is odd. I wonder if the issue is actually in the existing injector module itself? I have seen this fault appear once before when I was disconnecting the Adblue system and putting the new tank on. On inspection I couldn't see it was scaled up or contaminated at all. Though I wonder if it might have a fault preventing it from dosing properly. I have a new injector arriving on Wednesday this week and I can fit it easily enough. I can also return it if needs be. It's getting quite annoying now - I just wish this irritating Adblue fault goes away soon.

Dash display earlier on before going on my journey was showing Min 50G/Max 50G. I did a reset in VCDS and its not showing that now so I think it has to re learn it or something. I also filled the van up to the max with diesel.

Ill clear the faults now, drive back home and then do a re-scan.

I'm sure the Adblue pump itself is working OK since no strange readings appear to have arisen on VCDS to suggest it's not working right. I wonder if I can observe the system dosing Adblue at the injector, without the injector connected to the exhaust system ? Or maybe it doesn't allow this. I expect it should spray the Adblue out. Wondering if I put the van on axle stands again, disconnect the injector from the exhaust and drop it in a tray and see if it spray Adblue out?

Anyone reckon this injector experiment will work?

Anyway - fault scan below:

Saturday,02,August,2025,20:08:45:16365
VCDS Version: Release 23.11.0 Running on Windows 10 x64
www.Ross-Tech.com

Address 01: Engine Labels: 04L-907-309-V2.clb
Control Module Part Number: 04L 906 056 KA HW: 04L 907 445
Component and/or Version: R4 2.0l TDI H02 6163
Software Coding: 00114014430501090000
Work Shop Code: WSC 02737 790 50316
ASAM Dataset: EV_ECM20TDI03004L906056KA 004012 (VN75)
ROD: EV_ECM20TDI03004L906056KA.rod
VCID: 76B5E6C56844C36A05F-8022
2 Faults Found:

23871 - EGR System
P0401 00 [01100100] - Insufficient Flow
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 272506 km
Date: 2096.01.09
Time: 19:20:55

Engine RPM: 2621.25 /min
Normed load value: 52.5 %
Vehicle speed: 111 km/h
Coolant temperature: 91 °C
Intake air temperature: 25 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 13.296 V
Unlearning counter according OBD: 40
EGR travel diagnosis: strongly increased NOx emission: 0.00 kg/h
Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value: -115.89 %
EGR travel diagnosis: marginally increased NOx emission: -49.80 kg/h
Mass airflow sensor 1 bank 1 airflow: raw value: 871.8 mg/stroke
Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 0.00 %
Charge press. ctrl deviation after throttle valve bank 1-Pressure_16_signed_10_mbar: -118.9 mbar
O2 sens. 1 bank 1 upstrm oxi cat: raw value: 2.606 counts

31149 - Reductant Flow
P218F 00 [01100000] - No Flow Detected
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 272534 km
Date: 2096.01.09
Time: 20:01:54

Engine RPM: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 89 °C
Intake air temperature: 33 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 12.312 V
Unlearning counter according OBD: 40
Outside temperature sensor 1: B1: raw value: 28.0 °C
Reducing agent pump module relative press.: calculated: 0 mbar
Reducing agent fill level sensor: act. value: 92 mm
Sensor for reducing agent tank temperature: temperature: 25.1 °C
Reducing agent system pressurization release conditions-Engine running: Condition not met
Reducing agent system pressurization release conditions-Press. enabled: Condition not met
Reducing agent system pressurization release conditions-Heat. strategy: enable: Condition not met
Reducing agent system pressurization release conditions-Depressurized min. time below limit: Condition not met
Reducing agent system pressurization release conditions-Catalyst temp.reached: Condition not met
Reducing agent system pressurization release conditions-Release due to jammed valve needle: Condition not met
Reducing agent system pressurization release conditions-Rinse function finished: Condition not met
Reducing agent system pressurization release conditions-Initial filling completed: Condition not met
Reducing agent system pressurization release conditions-Release via inducement: Condition not met
Reducing agent system pressurization release conditions: 87


Readiness: N/A