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Sounds like the gas expansion valve is not opening. I don't know how to test or repair it so you may need to visit an aircon specialist.

Hello Saj, Sorry to say it as I see it, but from your answers I don’t feel you are currently informed enough to end up with a favourable and lasting finish. Apologies, but if your friend has a bodyshop, why don’t you just entrust this job to him, but observe what he does so that you gain some experience of the correct procedure?

Hi Brian, my car has manual transmission so sort of takes that out of the equation for me. my car varies to be honest sometimes it’s very slight other times it’s quite a jolt. I'm going to try and get it on a ramp this morning, I’ll post later and let you know what I find. cheers

Evening folks, so might have made some progress tonight. On the drive home I was monitoring and recording live data for various sensors. My wife was in charge of pressing the “flag” button if the fault happened. This time it did happen and sure enough poised like coiled spring my wife hit the flag button. When I played the recording back, at the point that was flagged there was a dip in both the cam and the crank sensor readings! So I nudged the readings frame by frame until I got the frame before the hesitation the frame at it and the frame after. Luckily I was also monitoring crankshaft signal status as on the frame before and after the hesitation it’s reading is GAP FOUND but at the point of the hesitation it’s reading is WAITING GAP. I’m not going to get over excited for now. However, at least that gives me a starting point. I’ll remove the sensor and check the ring and flywheel condition as best as I can and then I’ll order a genuine sensor from Audi. I’ll run the car for a week or so and then I’ll come back with an update. I’d say this rules out a fuel issue, if it was lack of fuel I would still expect it to see the gap for the crank sensor. The only other possibility I can think of is that something is switching the ignition off for a split second but how unlucky would I have to be for that? (I do have a lot of bad luck to be fair). My only slight worry is that it’s visible on the graph for the cam, in my head I can make arguments as to why it would and why I don’t think it should be visible on both graphs. But let’s start with the crank sensor and take it from there. very sorry for the extremely long post, I’m not on many forums, I think they are a great source of information and I’m trying to be as informative as possible. wish me luck 🤞 Davie 👍

How did the new motor work out David?

I too have suffered a birdstrike which has cracked my LH led matrix headlight cover. Surely it is possible to replace just the polycarbonate outer cover? To replace the whole headlight seems typical of Audi dealers' desire to extract as much money as possible from their customers.

I would just like to ask. Why? The A6 Avant has quite a low profile and wide stance already. I am probably "old Skool" but I think some of these modifications ask the chassis and axles to do things that they were not originally designed for, and could cause premature failures of some components.

I can't help on that score. Do please let us know the outcome.