Ask your dealer for the one for the camera as it won’t be the same part number but I think it’s this one:

Audi TT 2015+ Rear number plate light bar (with reverse camera aperture)

Genuine Audi parts and accessories, direct from Cardiff Audi & Bristol Audi, United Kingdom

www.audipartsdirect.co.uk

The non camera updated version is part number 8S0827574B9B9 as here:

Audi TT 2015+ Rear number plate light bar

Genuine Audi parts and accessories, direct from Cardiff Audi & Bristol Audi, United Kingdom

www.audipartsdirect.co.uk

You will need the revised updated part it’s been updated at least onceI believe, they can still leak though so your best finding where the leak is coming from.

Other posts on here are useful including the below, make sure you clean the gutters on and around it.

https://www.ttforum.co.uk/posts/9667176/

https://www.ttforum.co.uk/threads/water-ingression-in-number-plate-light-66-plate-coupe.2030464/?post_id=9605985#post-9605985

and this one too:

https://www.ttforum.co.uk/threads/rear-number-plate-light.2036172/?post_id=9658558#post-9658558

To add to this post there is also some reports of some owners saying the water is coming though the 3rd brake light strip so they have had to replace part 8s0945097

 

Did you manage to sort it out?

 

I did but after I got it done, a few weeks later I went to the car wash and it broke again -.- Really disappointed, I guess they dont know where the leak is even after investigation, I presume the jet water forced water under the spoiler

 

Notsure if it’s the same on the coupe but I had a really good look around the spoiler area on my roadster when I gave a thorough wash last week.

When raised the spoiler to dry underneath it despite the car being level and all the drains being clear the water was pooling all the way along the back of the break light strip.

Fortunately mines fine but that is right above the area where the handle for the boot sits and any water getting in would go straight onto the number plate light.

I’d start looking in that area rather than the spoiler / tray that’s attached to the boot first

 

Notsure if it’s the same on the coupe but I had a really good look around the spoiler area on my roadster when I gave a thorough wash last week.

When raised the spoiler to dry underneath it despite the car being level and all the drains being clear the water was pooling all the way along the back of the break light strip.

Fortunately mines fine but that is right above the area where the handle for the boot sits and any water getting in would go straight onto the number plate light.

I’d start looking in that area rather than the spoiler / tray that’s attached to the boot first

I think an issue is when I got my car washed, they then opened the boot, even after shouting "dont open the boot" it forced the water to run into and seat where the numberplate lights are

 

I've fixed a few of these now. Every time it's been the seal between the boot lid and the spoiler tray. I use silicon sealant as well as the gasket with no issues sine

 

Do you mean when the spoiler is up you put sealant all around the black plastic tray under it?

What sealant did you use? If I was to do it I’d prefer a clear coloured one.

 

It's the seal between the boot lid and the spoiler tray. The metal is very thin and easily deformed by over-tightening the fixings. You have to remove the trim on the inside of the boot lid, raise the spoiler and unscrew the bolts. Remove the entire spoiler tray assembly, clean both faces and apply the sealant. It doesn't matter what colour you use as you won't see it. Then just re-assemble, being careful not to over-tighten the bolts around the spoiler tray. Probably about an hour's work all in.

 

Do you have any pics of this process thanks

 

Seems like a good point to repeat my usual Top Tip,

Don't use silicone, you'll never get it apart in the future.
Use No Nonsense Roof & Gutter Sealant Black 310ml - Screwfix which is non-setting.

 

This also seems to work but if it’s a good idea I’m not 100%. My friends TT he drilled a very small hole into the corner of the light holder (so inside towards the middle handle part) next to the light cover on each side at the bottom so if water does get it in it can drain out rather than fill up with water and damage the number plate lights.

This obviously doesn’t stop the issue of where the water is coming in but at least it can come out if it does.
He did it over a year ago with no issues since.

I did say what about if water gets inside, such as in a jet wash…but it still drains back out.

it’s a very very small hole but could still get spiders in but the holder is very easy to take out and clean if required.

 

I definitely need to get mine done

 

Have you tried the below? This isn’t a long term fix but should do for the time being until you can get it properly fixed:

Very very common, this needs to be a sticky post on the MK3 forum really, why isn’t it?

Water is getting in and not coming out causing you issues.

Clean the gutters (so there’s 2 holes nearer either end in the black plastic tray when the spoiler is up, make sure they are unblocked (they drain out via tubes at the side of the boot) and also on either end there are like rubber drains too, make sure they are free of dirt and also clean all around the spoiler and also see if you can see where the leak is coming in.

And for a quick “fix” but it doesn’t stop the water coming in but does stop most of the the immediate damage is to drill holes (2 or 3 little ones using something like a standard ikea drill will do) into near the led number plates lights are in the black plastic (have a look at it and drill where you think the water would fall to and drill a hole there) and after carefully put nail varnish on the wires on and around it so if there’s water getting in can get straight out and not sit there causing immediate damage, even if water gets there from a jetwash it will still drain out).

Also after that if water from this was getting the actual boot then dry it as much as you can, especially if it’s around the battery, carefully put towels and paper towels in it (not on the actual battery!) for a week after to dry it/ see if the work on cleaning the drains and drilling the small holes has worked).

But you should then find out where the water is coming in and sort that for the long term! (It’s probably coming in from the spoiler seal somewhere) so needs sealant/to be resealed.

If your car doesn’t have a reverse cam then if you buy a new light fitting (pointless until you sort the leak = either properly or as I said above with the drilling of small holes) then you need the updated part number of 8S0827574B9B9 (again this is the non camera version).
If your car does have a cam at the time of posting this the updated version is 8S0827574C9B9

See my reply on the below too although there are lots of posts on this issue:

https://www.ttforum.co.uk/threads/water-in-the-number-plate-lights.2037191/?post_id=9667266#post-9667266

FYI if you do want to remove the light fitting see link below