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If you think it's an Adblue fault, would it be worth enquiring about having the system mapped out. Adblue pumps, heaters etc. are bloody expensive, but you wouldn't have to worry about Adblue anymore. **

**
Where's the innocently whistling smiley when you need it.   

I agree with Dave.    If the pipe has no home, and more importantly appears to have never had a home, I'd agree that it's the transmission breather pipe. It just tucks up randomly behind the engine, as you have found. That one catches a few people out. 

Cheers!!

 

Hi Dave,
Thanks for your help.
I've wasted the last 3 hours work backtracking, but I am satisfied with the solution.
You're right, it seems odd to me too. I've certainly never noticed it before.
Cheers anyway.
Graham

Yes. Spot on. It doesn’t connect to that valve. It just pops down into the gap in front of that shiny coolant transfer pipe.

Seemed odd to me at the time but…

Hi Dave,

I've presumed that your yellow arrowed pipe connects to the plastic union just to the left of it.
Now I think you don't mean that, but the pipe is just an open ended breather of some type.
Is that correct?

Well, unless I’m corrected by someone more knowledgeable I’d say that’s the same one.

Seems to come from left (passenger) side of the transmission, hoops over the back of the engine towards the drivers side then seems to go down to nowhere.

No evidence of a pipe clip, hose connection or anything. Just seemed to tuck away at the back of the  engine. I was informed that it’s an auto transmission breather pipe.

Hi Dave.
Yes Automatic.

https://photos.app.goo.gl/Wz1fvCWQPLfmcF1D9

another photo showing the pipe in question and what I think is your pipe.

I see it now. I reckon it’s the same pipe.
Is this auto transmission ??

try this please.

https://photos.app.goo.gl/BvRVYgkWE5R9p6pd8

Graham.