Adblue injector location? Audi A6 Allroad 3.0 BiTDI C7 (UK)

[-MONKEY-]

Hi from a newbie. Can someone please tell me wherebis the Adblue (/DEF/SCR) injector? Having all sorts of issues with Adblue so wanted to check the injector to see if it's leaking or whatever.

I'm getting through about 10 litres of Adblue a week (!) so I'm assuming there's either a major leak somewhere or the injector's stuck open with crystallised Adblue. Can't see any obvious leaks under the car so it's more likely the latter I'd think.

Getting engine P20E8 faults, Adblue low level warnings etc. I keep clearing the codes, SCR lock and level with VCDS after topping up. It only makes the errors go away for a few days at most each time.

I've been Googling forever and can't find any relevant info about where it is. Most relate to non Euro 6 versions which I guess don't have Adblue systems (?). All I know is that it's apparently somewhere in between the cat and dpf (wherever they are!). 

Pleeeeease someone clue me in before I go nuts! Can't afford to take it to a dealer and no warranty left.

Any help much appreciated. Thanks!

If it helps, here's an overhead pic of my engine bay...

[cliffcoggin]

Search the rest of these forums and you will find that Adblu systems are becoming notorious for the problems they create and the cost of fixing them. You will also find possible solutions.

[-MONKEY-]

4 minutes ago, cliffcoggin said:

Search the rest of these forums and you will find that Adblu systems are becoming notorious for the problems they create and the cost of fixing them. You will also find possible solutions.

Thanks for the advice but the more I've searched (incl. here) the more my head spins! So much conflicting info out there. That's why I posted the question here.

I really don't want to go down the route of expensive (and often futile) replacement parts like a new tank, pump, module etc. 

Would you happen to know where the injector is please? Then I can check that out for a start, along with the metering line etc. Thanks.

[cliffcoggin]

1 hour ago, -MONKEY- said:

Would you happen to know where the injector is please? Then I can check that out for a start, along with the metering line etc. Thanks.

I have no idea where it is. Fortunately my Audi was from before the advent of Adblue so I never had to concern myself with it, and my little knowledge of the matter comes from these forums.

Essentially the system is known to become clogged with crystals. You will have to search for the information yourself on how to deal with it, or wait for somebody more knowledgeable such as Stevey Y for detailed information.

[Steve Q]

Your other option is to have a remap which can blank out the adblue system. 

[-MONKEY-]

14 minutes ago, Steve Q said:

Your other option is to have a remap which can blank out the adblue system. 

Yes thanks, I was aware of that. But it's a last resort as I'd rather stay legal. Also, I'm not confident that wouldn't bring on other problems later, like no more DPF regens, failed MOTs (if/when they can eventually test for deletes).

Mind you, I'm very close to having the delete. This whole Adblue rubbish is ridiculous. I've read countless posts about where the various problems might be, many by people who've wasted thousands trying to get it fixed. It seems no-one really knows all the answers, just ever more theories (including from the manufacturers & dealers!).

If I still can't get the answer to exactly where the injector is on this car I'll just give up and go ahead with the delete. Enough is enough!

[K3v]

Hi, 

 

Iirc, it's one of those. Top one maybe. 

 

 

Have you looked on you tube?  There are videos of it. 

I've seen a photo of the pipe leaking to the intercooler and it was covered with white crystals, should be easy to spot if it's a big leak. 

How long has it been using 10l a week?  Reason I'm Asking is that mine had spells of needing filling up a few times over a short spell then it would calm down. 

 

My tank packed in a few months ago and now mine is turned off, couldn't bring myself to pay the big bill. 

Edited Saturday at 09:18 PM by K3v

[spartacus 68]

The AdBlue injector attaches to the DPF (diesel particulate filter). On a 3 litre bi-turbo then I’ll bet it’s buried down the back of the engine and you’ll need a child’s hand to access!

https://www.lllparts.co.uk/catalogs/audi/RDW/A6AR/738/2/201/201034

Part 13, is the reluctant injector, has inlet AdBlue, electrical connection, and what I assume are two vacuum/return hose points.

Double check with Audi parts for part number which I think is 4G0131113E (been revised  a few times). Few videos on YouTube for cleaning injector with Wynns, plus clean aperture into DPF, importantly not dropping crystallised AdBlue in.

Good luck and let us know how you get on.

 

Edited Sunday at 10:35 AM by spartacus 68

[spartacus 68]

Reductant injector. God I hate auto-correct and the march of AI. 😄

[K3v]

Apologies if I gave duff info, didn't read the bitdi part. 

[-MONKEY-]

18 hours ago, K3v said:

Hi, 

 

Iirc, it's one of those. Top one maybe. 

 

 

Have you looked on you tube?  There are videos of it. 

I've seen a photo of the pipe leaking to the intercooler and it was covered with white crystals, should be easy to spot if it's a big leak. 

How long has it been using 10l a week?  Reason I'm Asking is that mine had spells of needing filling up a few times over a short spell then it would calm down. 

 

My tank packed in a few months ago and now mine is turned off, couldn't bring myself to pay the big bill. 

Thanks for the photo. That's exactly the same as mine (3.0 BiTDI). Guess yours is also RH drive (in the UK)?

However, I'm pretty certain it's neither of those 3 connections into the exhaust. The SCR injector apparently has 4 attachments: 1 for the electrical connector, 1 for the Adblue feed and 2 other pipes (whatever they're for). See the attached pic.

I've put about 40 Ltrs of Adblue in over the last couple of months and done no more than say 3,000 miles in that time. Also been using the Wynns de-crystallizer each time in the hopes that might clear things up. The last time I put another 10 Ltrs in last week, the warning light disappeared but was back on again within only about 20 more miles.

Either there's a mighty leak somewhere or maybe the injector's stuck open (?). Inside the tailpipes looks clean & dry though. 

Really don't want to put it with a dealer. Countless posts show they don't really know what the issues are either and will just blow your money replacing expensive parts like a new tank, injector, nox sensor etc and still not sort it out.

This whole Adblue issue is an outright disgrace. Audi should solve it and offer a free fix for ALL cars, even out-of-warranty.

I'm getting very close to an Adblue delete now. Would rather not go that way though. If I can finally find out *where* the injector is I'll try cleaning it as a last resort. 

Edited Sunday at 03:58 PM by -MONKEY-
typo

[-MONKEY-]

5 hours ago, spartacus 68 said:

The AdBlue injector attaches to the DPF (diesel particulate filter). On a 3 litre bi-turbo then I’ll bet it’s buried down the back of the engine and you’ll need a child’s hand to access!

https://www.lllparts.co.uk/catalogs/audi/RDW/A6AR/738/2/201/201034

Part 13, is the reluctant injector, has inlet AdBlue, electrical connection, and what I assume are two vacuum/return hose points.

Double check with Audi parts for part number which I think is 4G0131113E (been revised  a few times). Few videos on YouTube for cleaning injector with Wynns, plus clean aperture into DPF, importantly not dropping crystallised AdBlue in.

Good luck and let us know how you get on.

 

Thanks. I've seen countless YT videos and posts over days on end. Also, the parts catalogue diagrams I've seen are confusing - so many different ones and nothing that clearly identifies them as being relevant to my specific car.

Not much on YT about BiTDIs at all in fact. I believe there are lots of differences in the layout compared to the normal TDIs.

I've had a peak underneath the car but can't see anything obvious. I'd rather not have to remove any covers unless I know what's hidden by them. Apparently the injector can be just about anywhere, front or back, depending on the exact model. It's not even obvious to me where the Cat' & DPF are. I'm told the injector is somewhere in between them.

And yes, "reluctant" injector is possibly appropriate. Or should that be "over-keen" in my own case? 😉 

Any more ideas about *where* exactly this is hiding would be very welcome.