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I sent my A4 allroad B9 for an MOT - no lights on pre MOT. Collected it with the Yellow warning triangle and Auto headlight fault. Garage denied they did anything. Also, all the dash board lights went superbright and the dimmer wouldnt work. Local Audi specialist helped out, the told me the MOT guys tripped a fuse but i wouldnt be able to prove it. Took them a while to find the right fuse that was blown as its not numbered ( Thanks Audi). Located in passenger footwell in Fuse Carrier 2 ST2. Just thought i would share.

I have just successfully completed the process of sealing the lower edge of the wind deflector mechanism and may reports that leak is fixed as tested by a garden sprinkler showering the car for half and hour. So many thanks to all those who have contributed to this fix. A couple of points: I have removed the pair of spring steel components that sit at the end of the wind deflector curtain so that I could seal the pocket that they sit in. That said the sunroof operates perfectly without them. Not sure what their function is, but perhaps as an anti-rattle for the sliding panel? Anyone? I dropped the headlining on the passenger side mostly so that I did not have to remove the trim and potential damage the airbag on the driver-side A pillar. With Sun visors, grab handles and the central overhead control panel removed I could just about apply gaffer tape to the underside of the perforated mounding that holds the rubber seal of the fabric air deflector, this as recommended here prevented any leakage of sealant to the underside. The sealant I used was a “ modified silane” or MS sealant/ adhesive such as CT1, but many MS sealants exist now and are popular as they have a moisture curing capacity and don’t mind damp condition. I placed the mastic gun tube in warm water for 30 minutes to make it flow reasonably freely as it was 4C outside when doing this. Again thanks to all contributors, demonstrating the power of the group.

So just an update after 6 months gearbox issue reappeared. Countless trips to the dealer and with no help I had enough. Took it to a reputable car garage was diagnosed it as a faulty mechatronics unit. Sent to ecu testing and repaired 3 times but every time fault came back. So finally after threatening the warranty company with legal action the have agreed to change the unit. Have not had my car for over 3 months. Fingers crossed il have it back next week:

Devious illegitamate offspring.

Hi, Thanks for your post, I will mention it when in Audi next week. Me too, I am frustrated with it, and not enjoying it, as I should be for £56,000! I won’t be choosing a plug in hybrid again, that’s for sure!

The mechatronic module is notoriously difficult to overhaul so is best left to a specialist. Try the oil and filter change as a first step.

Please keep us posted on how you get on. Be prepared to fight it with the warranty company as I'll bet they'll say it's wear and tear. As you paid £7.5k for it makes me wonder if the seller knew the chain needed doing and knew what costs were involved.