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Hi all, I had the same issue where the brake servo and stop start error appeared. After reading this helpful thread, I thought I would do my part to help out too. 🙂 Issue stared on the 5th June 2021 and it was fixed on the 9th June 2021. The car has been driven for approx. 100 miles during this time. I've called up Cardiff Audi and fortunately they have one sensor left in stock. Please note that 5Q 0906207, 5Q 0906207A, 5Q 0906207B are all cross compatible as confirmed by Audi parts department. But of course best to get the latest B version if available. Please note VW, Sea

Might be worth you trying to source a second hand turbo from eBay to get the part you need.

Thanks Kev, I have been told by the company that did the remap that it is now fixed, a "lose wire" apparently. I will be asking questions regarding the lose wire, location etc and will put on here for future members to review as may help them.

An update from me too. I ordered the sensor (5Q0 906 207 B) from Cardiff Audi on Friday and it arrived this morning. It took a few minutes to remove the old sensor (I think I was being too careful not to break anything off) - the hardest part for me was to unhook the latch on the sides, but installing the new one was super easy. Both brake servo and stop/start warnings disappeared immediately after the sensor was replaced. All thanks to everyone on this thread and especially Ambrose whose posts I found extremely informative! Obviously I'm not impressed that these parts are faili

Do you have roof bars for the Saloon or Avant? On my avant the roof bar feet clamp onto the roof rails. On the saloon the applicable feet will clamp under the roof ionto the door frame.

I have been checking ebay but no luck unfortunately. I have however found them available on https://www.onlinecarparts.co.uk/ at a really good price. Thanks

Update- local dealership can't see me for 4 weeks and doesn't have the part in stock but Audi Assist are coming out tomorrow morning to have a look at it.

There should be 2 elements. The bars and the clamps with a key to lock them in place on your roof bars.

Try your local reconditioners I personally have had loads of odd bits out of them for very little money if you ask nicely they normally have something laying about they generally keep everything in case they ever need it, I wish you the best of luck with it. Steve.

Oh yeah, 100% doesn't fully work. Still get an EPC light, but I get ~75% turbo vs 0% without it. It's just a stop gap till I find a scrapped turbo I can scavenge the bit off of.

Hi good skills, the only problem is that the home made actuation arm may cut down on the turbo flow rate as the Turbos when manufactured/reconditioned the actuator functions are set up in a flow tank using coloured smoke and measuring devices for airflow, I was privileged to watch one of my turbos being rebuilt at a local specialist, you don't appreciate how precise these things are until you watch the calibration process as the slightest adjustment of the actuator arm causes quite a dramatic difference in the flow rate across the rev range. I think Steves idea is a good one as a sto

Better to be safe than sorry and use one. But keeping your keys in your microwave when you go to bed can work just as well.

For anyone wondering, the answer is technically "yes", but you have to buy a whole new turbo.

Generally as close to 87MHz or 108MHz are the 2 best options in the UK but for Melbourne Australia it looks like your radio stations atr I have the same range so they should work there too.

put cd on lol kev

Hi guys, As promised, here is a short video of how to replace the Brake servo sensor of an Audi A4 B9. Not the best or clearest video, but I hope it helps. Let me know if you have any questions. Ambrose

Hi, I have same car and engine and almost same age. To diagnose the thromostat, if you are stuck in traffic, does it stay at 12 o'clock, and if you start driving say, above 50mph for 10 mins, does it go down to 10 o'clock? If so, the thromostat needs replacing. I did mine two weeks ago and now it stays on 12 o'clock all the time Also, check your oil level on these engines, they can burn 1 litre of oil for every ~600 miles (as stated in the manual). I do not have a high pitched noise in 2nd gear btw.

To celebrate 50 years since its creation, we are taking a look at the history behind the iconic Audi slogan, “Vorsprung durch Technik”. Though the slogan is still traditionally used across Audi's international promotional materials in German, for those curious, in English it roughly translates to "progress through technology". In August 1969, the Audi NSU Auto Union AG was created. Audi was working ahead of the current trends and the company’s range of models were being recognised for their great technical diversity. In 1971, Hans Bauer, who worked in the Audi NSU A

Hi Britorean, Yes I can do a video on how to install the sensor. I'll record it & upload it this shortly. Ambrose

If you bought it from a dealer then you have the right to a full refund within 30 days of sale.

https://www.google.com/search?q=1980+audi+b4+radiator&oq=1980++audi+b4+radiator&aqs=chrome..69i57j69i60l2.2750j0j15&sourceid=chrome&ie=UTF-8

You're welcome, I would have said driveshafts next. When mine failed my mechanic showed me a trick where if you hold the driveshaft once of the car so it's facing vertically, then give it a shake you should hear a rattle if it's failed. I did get 331k out of the original driveshafts though so mine definitely needed doing.

That's good then 🙂 all's well that ends well 👍

Nice one! It does amaze me with my a6 too. It did the north coast 500 last year and completed 2,253 miles in total abd never skipped a beat despite being (at the time) an 18 year old Audi with 332k on the clock.

I understand that if the sensor was changed before you had an ABS failure you should be ok.

Simon - thank you!! Saved me £130. Get the part and do it yourselves folks. I a completely hopeless at anything in any way technical and I managed it in a couple of minutes. Do NOT put it in the garage. Also just don’t drive it as soon as you get the error message - really not worth the risk. I would suggest getting the part from Audi if you can as I had a hell of a time with an online parts company who turned out were based in Germany and I waited over a week and it still wasn’t shipped. With shipping etc the part direct from Audi was £7 more expensive. Not worth the hassle. A

I have a 2017 A4 saloon 2.0 petrol. The brake servo restricted light came on 2 days ago but I didnt get around to researching it until today as I felt secure with the dashboard message saying it is ok to continue driving. Turns out that is a false sense of security and I wish I had looked up the issue earlier but I'm hopeful that I can still get away with the simple sensor replacement. After ringing around the 3 local dealerships in my area one said another has stock (same company with multiple dealserships) but annoyingly the parts department at that dealership haven't been answering my calls

If you have a fault code P2015 go to eBay and google P2015 repair bracket it solves the engine light

Don’t get an inlet you can get a bracket to fit the inlet flap the light is on because the throttle arm is travelling to far back also how old is the car

I have now had a PM from Charlotte, where as well as seeking more clarification on issues with the car, she advises that the charge made to renew the battery also included other investigations which were carried out without charge. I have asked her whether she objects to me posting this additional information contained within a PM, and no objection has been received. I feel I have unfairly judged her mobile mechanics (who I understand she is happy with and trust) - my judgement being based on the facts which were contained in her posts. For this, I apologise on behalf of the forum.