Hi everyone, this is my first post. And I will be straight to the point. I think I could be super unlucky! 

Car: Nov 2015 Audi Q3 - owned since 57k now 127k

I noticed my traction control like came on last year... 

Mechanic 1 (long term mechanic): sensor gone. Then ghosted 

Mechanic 2: sourced the problems didn't want to do the work. 

The problems: 1. haldex 4wd control module gone. (4 mechanics have confirmed)..2.Headlight on driver side - needs full replacement, it isn't just the control unit sadly. 3. Rear level light sensor gone ...4. washer jets need replacing. 

Mechanic 3: won't do the work as won't use used headlight etc. Drew up a bill of nearly 2k. 

Mechanic 4: we can get the parts cheaper leave it with us... 2 months later I think I am being ghosted again

What on earth do I do here?? I feel I have to just pay for new 4wd control unit and other things I can't get second hand but I am searching and searching for the headlight. MOT wS up in June but backlog means couldn't get an app to September which is now rapidly approaching! Car is serviced and in otherwise very good nick

Thank you so much for reading and any support 

Edited August 17, 2025Aug 17 by pcs91

I think you are unlucky Paula, but I may question where you've been taking the car to date, and the competency of the mechanics, especially given 4 mechanics have looked at the car to date. At this age and mileage I wouldn't be taking it to a main Audi dealer and paying exorbitant labour rates, but seek out VW/Audi specialist with lots of positive reviews. Check with friends and family too if in doubt.

So Audi Q3 2015, not identified engine, but to be honest it's not critical. You've put 70k miles on it since you've owned it, so in that time you should have had a few services, I'm hoping oil services every 10k miles, plus timing belt and water-pump, etc.

First things first. The issues are fairly mixed, and will range in price from a few pounds to a few thousand unfortunately.

So your car is 2 wheel drive, however with Haldex fitted, it will engage traction control on the rear wheels so you have 4 wheel drive if the car senses a lack of grip. This is found on S3, TT, etc. The Haldex unit requires servicing.

Now, not sure if this is just Audi, but on VW, then there's no specific requirement to clean the mesh filter on Generation 5 Haldex units (which yours will be). It's preferable by folk in the know, not only to drop the gear oil, but to clean the mesh filter on the pump. I think VAG (Audi/Volkswagen) recommend every 40k miles, but Volkswagen subsequently changed this to every 3 years regardless of mileage. Ironically I think Volkswagen don't even recommend the pump mesh is cleaned, they simply drop and refill the oil. I assume Audi is exactly the same. Your service paperwork may say differently.

If the pump filter is clogged, then it can burn out the pump and in turn - it burns out the electronic module as it draws too much current trying to pump fluid through a blocked mesh screen. You would need to determine if the module and the pump are both damaged. A VCDS scan should be able to read any logged DTC errors. If it's the module only - then new they are over £1k depending on specific part number. Again I don't know if component protection is fitted?

Watch this. Dave Sterl is old-school, but he knows his stuff.

In terms of headlights, if Xenon gas discharge, then headlight is circa £600 new. If it's LED, then unfortunately it's over £2k. You can search under LLL Parts for more details based on your chassis number. Mechanics will be reluctant to fit used parts as it won't be plug and play. Audi have component protection enabled, and it's not something that you can over-ride even with VCDS, then you get into removing the coding with dealer only software like ODIS.

Rear level sensor (will be located on rear suspension on passenger side. Electrical or mechanical - usually fails or corrodes. It measures weight of rear axle so headlights don't dazzle if the car is loaded. Again - usually straight forward to replace.

4 washer jets - not sure if windscreen or headlight washers - again, straight forward to replace. If it is headlight washers, you'll need to remove bumper to access. 

I think your first bet is to identify trusted garage or mechanic and get a fully itemised quote and proceed or not on that basis. A 2015 Q3 with nearly 130k miles is probably worth less than you think, ball park retail for £7,500 trade.

Probably not what you want to hear - but that's a detailed summary.

Edited August 17, 2025Aug 17 by spartacus 68

8 minutes ago, spartacus 68 said:

I think you are unlucky Paula, but I may question where you've been taking the car to date, and the competency of the mechanics, especially given 4 mechanics have looked at the car to date. At this age and mileage I wouldn't be taking it to a main Audi dealer and paying exorbitant labour rates, but seek out VW/Audi specialist with lots of positive reviews. Check with friends and family too if in doubt.

So Audi Q3 2015, not identified engine, but to be honest it's not critical. You've put 70k miles on it since you've owned it, so in that time you should have had a few services, I'm hoping oil services every 10k miles, plus timing belt and water-pump, etc.

First things first. The issues are fairly mixed, and will range in price from a few pounds to a few thousand unfortunately.

So your car is 2 wheel drive, however with Haldex fitted, it will engage traction control on the rear wheels so you have 4 wheel drive if the car senses a lack of grip. This is found on S3, TT, etc. The Haldex unit requires servicing.

Now, not sure if this is just Audi, but on VW, then there's no specific requirement to clean the mesh filter on Generation 5 Haldex units (which yours will be). It's preferable by folk in the know, not only to drop the gear oil, but to clean the mesh filter on the pump. I think VAG (Audi/Volkswagen) recommend every 40k miles, but Volkswagen subsequently changed this to every 3 years regardless of mileage. Ironically I think Volkswagen don't even recommend the pump mesh is cleaned, they simply drop and refill the oil. I assume Audi is exactly the same. Your service paperwork may say differently.

If the pump filter is clogged, then it can burn out the pump and in turn - it burns out the electronic module as it draws too much current trying to pump fluid through a blocked mesh screen. You would need to determine if the module and the pump are both damaged. A VCDS scan should be able to read any logged DTC errors. If it's the module only - then new they are over £1k depending on specific part number. Again I don't know if component protection is fitted?

Watch this. Dave Sterl is old-school, but he knows his stuff.

In terms of headlights, if Xenon gas discharge, then headlight is circa £600 new. If it's LED, then unfortunately it's over £2k. You can search under LLL Parts for more details based on your chassis number. Mechanics will be reluctant to fit used parts as it won't be plug and play. Audi have component protection enabled, and it's not something that you can over-ride even with VCDS, then you get into removing the coding with dealer only software like ODIS.

Rear level sensor (will be located on rear suspension on passenger side. Electrical or mechanical - usually fails or corrodes. It measures weight of rear axle so headlights don't dazzle if the car is loaded. Again - usually straight forward to replace.

4 washer jets - not sure if windscreen or headlight washers - again, straight forward to replace. If it is headlight washers, you'll need to remove bumper to access. 

I think your first bet is to identify trusted garage or mechanic and get a fully itemised quote and proceed or not on that basis. A 2015 Q3 with nearly 130k miles is probably worth less than you think, ball park retail for £7,500 trade.

Probably not what you want to hear - but that's a detailed summary.

Hi component protection and SFD were only added to VAG vehicles 2019 on you can still code in new parts and disable the SFD/Component protection as long as you have the old part coding and the new part code simply buy lifting the bonnet.

Steve.

Hello Spartacus, thank you, honestly I appreciate your reply so much.

I've been bringing it to pretty good mechanics ( so I thought, I live in NI we are limited and to be honest I've actually found it extremely difficult to get a mechanic who will stick). I pay my bill up front and don't expect appointments next day or anything so I get a bit confused to why they are so flaky! Audi is 150 per diagnostic and then the parts and labour, I almost fell off my chair. Totally out of my price range. 

Anyway, to update, my brother also uses the most recent garage and the guy replies to him and never replies to me so he spoke to him today and he had the headlight just can't get the haldex. I have opted to get the part repaired with a lifetime warranty. I can't afford any other way.

I maintained the car very well, it has been serviced twice a year and had a new timing belt and water pump st 78k I think (that's another story, of a dealer trying to ignore me until my warranty ran out lol) but thankfully the finance company stepped in.  It seems the ball may be rolling now thank goodness. Can I ask about your final point regards reading it in for 7500? Is that what you mean? If that is the case I would be delighted with that. I need a new car anyway but I couldn't sell it as it is and without MOT. I was thinking of a Skoda kodiaq and it would have to be a trade in I think.  

Wish me luck with the final bill, it will certainly be less than brand new parts but R.I.P to my bank balance 

Good news Paula.

As Steve had mentioned- a lot of new parts are security protected. You'll see it featured on the forum with regards MMI systems, amps etc. 

I priced the Q3 based on Autotrader, that's a 2015 model with 125k miles - that a retail trade price, not what you could get for it. Privately - probably £5k. In my experience - anything not working, then traders will drop the price and private buyers don't have the knowledge to fix, unless they know the model specifically, and of course that's with a year's MOT.

Had a Skoda before and I like the brand. I think their new cars are looking better these days. The Kodiak is a big old lump, so whatever you opt for, get a decent warranty, as unfortunately these cars are sensor heavy.