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That it leaks more when the engine is running suggests it is the shaft seal. Speculating further, is it possible the crankcase ventilation is not working properly? I am wondering if excess pressure in the crankcase is actively blowing oil out.

Hello John, I do feel for you. In your situation, I think it would be a ‘good investment’ to spend an hour’s labour with a trusted local garage, with a view to better sourcing the site/s of the leak. Kind regards, Gareth.

Thanks for the vote of confidence. I took one nice rear quarter shot and now the car is dirty lol

Hi I really would not bother with the crankcase vent at the moment, the rear seal wont leak when the engine is static because the crank is not revolving, when the engine is running it will leak 360 degrees I would doubt the crank is worn, billet steel verses rubber, only ever going to be one winner, I had mine changed [2.0 CNHA] but they are basically the same, box out, flywheel off, ring gear plate removed then the seal unbolted it sits in a metal housing with the crank position reluctor ring, the engine will need to be timed to tdc on cylinder 1 and the witness mark on the reluctor ring directly opposite the marker on the casing, its a mission as you will need to replace the driveshaft seals as well as they are one hit wonders, the timing and pinning is crucial as if the reluctor ring alignment is not exact it wont start. Steve.

Congratulations Branagh, you have just won the prize for shortest written post. We do not charge by the word!

Search for EGR (exhaust gas recirculation).

The days of regarding Audi as prestige cars have gone. The company is just another manufacturer fighting to gain market share by any cost cutting means possible.

If it is the crankshaft seal that is leaking, there is a distinct possibility that after 240000 miles the sealing surface on the shaft is also worn to the point that a new seal will not stop the leak. That would be a very expensive fix, and to cap it all you won't know until the engine is stripped.

Dennis - bless him- ‘will definitely let you know how I get on’! Regrettably, never did.

What was the result of Halfords visit? Did they test the battery?

I have no idea what the hole is for, but it does appear to have a plug in it. Is that plug metal or rubber? Does it have a hex top or slot to allow it to be screwed in? Whatever the reason for its existence there must be a way to seal it that does not involve another engine.

Be grateful you did not buy it and feel pity for whoever did.

A 2.0tfsi with no service history! Wouldn't touch it. The 2.0tfsi was notorious for oil consumption problems and eating piston rings which are expensive to fix. If it's too good to be true it probably is.

So...mystery solved! Turns out when you watch a VW Sharan video to find a part on an Audi A6...not everything is in quite the same place 😂! I was looking about 2ft too far forward! The NOX sensor 2 for the A6 Allroad is quite far back from the catalytic converter and where the pipes become one again (so not sure why it lists it by bank on the fault code, although maybe it has to list a bank by default 🤷‍♂️). The sensor electronics plate is under the rear most underbody panel, on left of the car (UK passenger side), which comes off with 4 Torx screws. I'm yet to actually try to get the sensor out of the exhaust but did manage to take the plate off to confirm the part number. Photos below!

Dealer or private sale Will? If the latter, my angle on any private sale is don’t get interested in purchasing any vehicle from anyone, unless it has a V5 registered to the owner at the address you are viewing it at. Length of ownership would also be important to me. It could end in tears. Kind regards, Gareth.

No service history and no log book (V5)? I wouldn't touch it with a barge pole.

Morfit update: Normality resumes. Yes, all is well and comfy with yet another slight adjustment and we now have that sweet-spot. Not only that but I have not felt I’ve needed to adjust anything this week at all. I will though have a reset using the E-Pump (perhaps fortnightly) just to keep its plumpness and just to add that the actual position of the cushion on the seat it has not moved despite the climbing in and out of the car. I don’t even think about it now, it’s there and it’s doing the job I was hoping for. I guess I’m at that point of, would I recommend or not. I’m going to give two answers. No surprise there I hear you say! Probably from a financial point of view I would not, albeit, I have gotten over that initial hit in my pocket. On the point of quality, ease of use and lumbar support/comfort I am without remorse with my purchase. I’ll finish up by reiterating a comment I made earlier: You have 30 days to try before contacting them for a refund should you not be happy. I think there is little else I can say on the subject. I hope I have given a fair and subjective account of my findings. For those in need of lumbar support I hope you find what you are looking for. Lastly, to say thanks to all those that have shown an interest in my endeavour. Terry.