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[YZ250]

………
At the moment the MOT does not check NOx levels (which is what SCR/AdBlue addresses) however, there are moves to do so, at which point it would be spotted

I assume then that they’ll have to test NOx levels based on build year design. In other words, if it left the factory with an Adblue system, it will be tested as such. 
The reason I question this is because some car manufacturers have the same diesel engine, built in the same build year, but one has Adblue and all of the associated SCR gubbins and mapping and the other one doesn’t. So, in the first half of the build year there was no Adblue, and then later build had the Adblue system. This is common in the likes of BMW diesel engines and VAG engines. My son’s build date for his car (same engine as mine) is just two months earlier than my car’s build date, but he doesn’t have Adblue and I do, hence my question of testing as per factory design. I grant you that a quick look will make it obvious what they are testing, but it seems to make a mockery of the test when essentially the same two engines will have different pass levels. 

[Marks DTM Calib]

It would be based on manufacture date, the reason a car changes the specs in the middle of a year is to prep and flush the production ready for the following years regs/features.

So for example, many car manufacturers will be cutting over to 27MY in the coming months 

Hence you see an engine emission system change mid year at a model year change (it would be tested based on the easier emission standards, despite the extra complication)

[YZ250]

It would be based on manufacture date, the reason a car changes the specs in the middle of a year is to prep and flush the production ready for the following years regs/features.

So for example, many car manufacturers will be cutting over to 27MY in the coming months 

Hence you see an engine emission system change mid year at a model year change (it would be tested based on the easier emission standards, despite the extra complication)

Thanks, I assumed that would be the case for testing.    I fully understand the build issue for new models, life cycle changes etc., as I worked in the car industry myself for forty years, but thanks for explaining it. 

[Andy B]

The usual issues are crystals in the injector (mounted in the exhaust), you can also see NOx sensor faults on earlier AdBlue based cars.

The injectors are usually reasonably easy to remove and clean, the NOx sensors are also usually easy to replace (but not cheap!)

AdBlue cars need to do the mileage, if not they do have issues..........there is potential that new NOx levels for petrol cars (which are currently set higher than diesels) could also result in AdBlue fitted to gods own fuel powered vehicles

These are the codes :- 16D300 16D400 18B800 18B900 18BC00 which all seem to relate to crystals etc

Though this car doesn't do loads of miles, when it does, it's not  normally just nipping to the corner shop .... it'll frequently have the caravan on the back or at the least 25 miles each way to work.

[Doctor Gollum]

There was some Forte anti-crystal stuff in the tank but  it's suggested that you should not fill the tank completely .... & I did just that a few months/hundred miles ago.
The codes relate to NOx sensors & possible crystals ... 
I'll see what the garage (merc indie) suggests next week.

Chap next door has a '17 CLS 350 and he's been quite careful regarding where he buys and how he store adblue for his car. He topped it up recently and noticed as he was filling it that it didn't look right. He's added some anti crystal to it with fingers very much crossed.

He has noted that because it doesn't have a gauge it's almost impossible to guess the fluid level when the warning pops up and therefore how not to overfill it... So simply adds a couple of litres or three each time.

[Doctor Gollum]

The usual issues are crystals in the injector (mounted in the exhaust), you can also see NOx sensor faults on earlier AdBlue based cars.

The injectors are usually reasonably easy to remove and clean, the NOx sensors are also usually easy to replace (but not cheap!)

AdBlue cars need to do the mileage, if not they do have issues..........there is potential that new NOx levels for petrol cars (which are currently set higher than diesels) could also result in AdBlue fitted to gods own fuel powered vehicles

These are the codes :- 16D300 16D400 18B800 18B900 18BC00 which all seem to relate to crystals etc

Though this car doesn't do loads of miles, when it does, it's not  normally just nipping to the corner shop .... it'll frequently have the caravan on the back or at the least 25 miles each way to work.

If you pop the engine cover off, there's something the looks injectorish bolted into the exhaust next to the turbo. Next door has it on his engine but it wasn't present on either my ML or R... Both non dpf/non adblue.

If this is potentially the culprit, then at least it's accessible...

Also if it is the case, could it be possible to undo the other end from the adblue pump and clean the line?

Not sure there's much to be done with the pump itself or the tank though

[Doctor Gollum]

………
At the moment the MOT does not check NOx levels (which is what SCR/AdBlue addresses) however, there are moves to do so, at which point it would be spotted

I assume then that they’ll have to test NOx levels based on build year design. In other words, if it left the factory with an Adblue system, it will be tested as such. 
The reason I question this is because some car manufacturers have the same diesel engine, built in the same build year, but one has Adblue and all of the associated SCR gubbins and mapping and the other one doesn’t. So, in the first half of the build year there was no Adblue, and then later build had the Adblue system. This is common in the likes of BMW diesel engines and VAG engines. My son’s build date for his car (same engine as mine) is just two months earlier than my car’s build date, but he doesn’t have Adblue and I do, hence my question of testing as per factory design. I grant you that a quick look will make it obvious what they are testing, but it seems to make a mockery of the test when essentially the same two engines will have different pass levels. 

I don't know when MB added it, presumably when EU5 became a requirement 

[YZ250]

……
He has noted that because it doesn't have a gauge it's almost impossible to guess the fluid level when the warning pops up and therefore how not to overfill it... So simply adds a couple of litres or three each time.

Mine holds 17 litres so when the 1500 mile warning popped up I could quite happily put 10 litres straight in. 

The expense in my case was, the Adblue pump and filter is integrated in to the tank, so is ordered as a complete unit. I also have an inline heater and VagCom can’t pinpoint the exact part that is at fault, just the fault itself, hence why it was suggested to replace all of the feed side of the Adblue gubbins. The exhaust screen can be cleaned so not so much of an issue.

[Marks DTM Calib]

These are the codes :- 16D300 16D400 18B800 18B900 18BC00 which all seem to relate to crystals etc

Though this car doesn't do loads of miles, when it does, it's not  normally just nipping to the corner shop .... it'll frequently have the caravan on the back or at the least 25 miles each way to work.

18B8-00 is the NOx sensor reporting that the NOx levels are not where they should be (difference between measured and calculated is to great)

18B9-00 is usually related to the AdBlue heater (although that shouldn't really be operating in this weather)

18BC-00 is related to the adaptions (as you would expect if there is a fault)

The others just report out that the re-start timer is operating (as you see in the cluster).

I would certainly start with removing and cleaning the injector, it will be after the DPF and before SCR (the cat, lets hope it's not the metering valve)

[STEMO]

My son has a 2019 VW Passatt 2.0 TDi with over 100k on it. A couple of years ago, just prior to the MOT, an Adblue fault came up on the dash. A former Audi technician stated the repair cost was quite steep, so suggested an Adblue delete. This was done at a relatively minimal cost, and the warning has not reappeared with no need to replenish the Adblue. The increase in the emissions reading at the next MoT was virtually non existent and it passed with no issues, as it has done ever since.

At the moment the MOT does not check NOx levels (which is what SCR/AdBlue addresses) however, there are moves to do so, at which point it would be spotted

https://www.gov.uk/government/consultations/changes-to-the-date-of-the-first-mot-test-and-research-into-other-mot-enhancements/changes-to-the-date-of-the-first-mot-test-and-research-into-other-mot-enhancements

[Andy B]

.....
Chap next door has a '17 CLS 350 and he's been quite careful regarding where he buys and how he store adblue for his car. He topped it up recently and noticed as he was filling it that it didn't look right. He's added some anti crystal to it with fingers very much crossed.

He has noted that because it doesn't have a gauge it's almost impossible to guess the fluid level when the warning pops up and therefore how not to overfill it... So simply adds a couple of litres or three each time.

No gauge on mine either. I've always just added a gallon or so every now & then. Id bought a 2 gallon bottle from Costco a few months back  and recently added that (a few months/few thousand miles ago) Nothing seemed abnormal at the time.

[Andy B]

These are the codes :- 16D300 16D400 18B800 18B900 18BC00 which all seem to relate to crystals etc

Though this car doesn't do loads of miles, when it does, it's not  normally just nipping to the corner shop .... it'll frequently have the caravan on the back or at the least 25 miles each way to work.

18B8-00 is the NOx sensor reporting that the NOx levels are not where they should be (difference between measured and calculated is to great)

18B9-00 is usually related to the AdBlue heater (although that shouldn't really be operating in this weather)

18BC-00 is related to the adaptions (as you would expect if there is a fault)

The others just report out that the re-start timer is operating (as you see in the cluster).

I would certainly start with removing and cleaning the injector, it will be after the DPF and before SCR (the cat, lets hope it's not the metering valve)

Thanks Mark.... i shall have a look

[YZ250]

……..
https://www.gov.uk/government/consultations/changes-to-the-date-of-the-first-mot-test-and-research-into-other-mot-enhancements/changes-to-the-date-of-the-first-mot-test-and-research-into-other-mot-enhancements

Andy hasn’t got time to read all of that, he’ll be spending his time setting up a Gofundme account to pay for it all. 

[Marks DTM Calib]

The latest is to do a basic check as even at idle you can tell if the emission systems have been mapped out or not

[Andy B]

……..
https://www.gov.uk/government/consultations/changes-to-the-date-of-the-first-mot-test-and-research-into-other-mot-enhancements/changes-to-the-date-of-the-first-mot-test-and-research-into-other-mot-enhancements

Andy hasn’t got time to read all of that, he’ll be spending his time setting up a Gofundme account to pay for it all.