Steve Q

How old is the battery? That'd be my first port of call as a failing battery can cause various electrical gremlins or a diagnostic check to see if any fault codes flag up

I think you do have to go from underneath unless you take the bumper off which is more of a faff.

Could be the rear light seals or the seal where the roof meets the boot.

Ha r you had a diagnostic check to see if any fault codes flag up? Could it be a faulty injector?

You can try and get Audi to do it but it's a long time for the recall not to have been done and car is now 15 years old.

Welcome to the forum you'll find the members on here are a friendly and helpful bunch 🙂

Welcome to the forum you'll find the members on here are a friendly and helpful bunch 🙂

Welcome to the forum you'll find the members on here are a friendly and helpful bunch 🙂

Not for the grille unfortunately

Yep just needs to be running

Glad you're still loving your A4. I'm still loving my A6 despite it currently being a drive ornament 🤦‍♂️

Spoiler should be straightforward.

Could it be a fault with the AC Module?

Yea I believe there should be injector seals. I'd recommend speaking to Audi parts department as they'll have the schematics.

Might be better to replace the regulator too as per David's suggestion.

You could try and get the egr cleaned out. If you do replace it ndke sure it's a genuine one and not aftermarket rubbish. The turbo could have vains broken off. Is there any lag in acceleration?

These Safety systems are crazy. Lane assistance a prime example. The only decent one is emergency braking when it's stopping you in a genuine situation and not a plastic carrier bag!

Could it be an issue with the maf, crank sensor, lambda sensor or cam sensor? I appreciate in theory a code should flag up.

Never used either of those sites. I've got kyb shocks on my A6 on the rear and they're ok. Have you tried eBay or euro car parts?

Yep could be seized. You've done good.with diagnostic process so far.

Fantastic show report, thank you for sharing. It's a shame we didn't have a club display but we didn't get enough interest. Nice selection of cars there. Seemed a lot of money on the day £20 to just be in a field. Especially when you compare it to Simply Audi. I believe some of the trade stands bailed on the day.

Hi Tom welcome to the forum you'll find the members on here are a friendly and helpful bunch. I'd recommend you search eBay but include international sellers. This is what I'm now having to do with my 21 year old a6 c5.

Welcome to the forum you'll find the members on here are a friendly and helpful bunch 🙂

Was it working at all.in your ownership?

Engine code should be on the build sticker in the spare wheel well or in the inside front cover of your service book.