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That is madness. Fitting new parts at random will cost you much more than taking the car to a properly equipped and knowledgeable garage.

Thanks for letting us know. Be glad the water did not leak into the cabin, it would have permanently stained the head lining.

Do front end refresh as suggested. Also check bushes on ARB, not the links, the actual bushes. For all arms - torque to final setting with wheels on the ground or you'll stress bushes. If knocking persists - could be inner tie-rod. Again check for play. Look at top-mounts too, plus coil springs. Not uncommon to have a break in the spring near the end.

Gareth, it’s not been easy but I am close to a solution. I will come back as promised with the end result. All I will say at this point is (and readers may already know this) if anyone has an issue with an Audi dealer, get Audi UK involved asap. To date they have been exceptional. I’ll be back…

If it's over 100k miles which is likely, then probably needs front end refresh for multi-link suspension. You can replace bits and pieces, but you need to mirror that both sides. Lemforder is OE, but I'd fit that or Meyle HD. Will need tracking and alignment afterwards.

Irena. I sympathise with your predicament, but without a firm diagnosis from a code reader we can only guess which of the many possible faults are responsible for the problem. Those possibilities include a blocked diesel particulate filter, a dying battery, faulty fuel pumps, faulty mass air flow meter, and several others as well. It is clearly uneconomic to renew every possible part in the hope that you will be lucky. Audi should be able to diagnose a car as young as yours, and I am puzzled your workshop can not do so. Is there an alternative Audi workshop you could try? Are there any independant VAG specialists you could try? (Many of us here prefer independant workshops for reasons I need not mention here, but I do not know if they exist in Germany.)