kh904

Hi, It's well worth reading the whole thread (it will answer all your questions and gives the sensor part code and fitting instructions). Essentially I wouldn't bother driving it if possible until the sensor is changed - you are at risk of a heavy expensive bill to replace your ABS module! The sensor can be picked up from Ebay for around £20 (a chinese copy) or £90 (OEM from Audi) and swapping the sensor literally takes 2 minutes (it's so simple).

Sorry to hear on your troubles Claudster! It's disgusting and an outright lie that Audi claim that they are unaware of the issue. I believe a number of people on this forum have informed Audi of the issue. Maybe someone can consult a class action lawyer/motoring organsiation to push our cases? All Audi need to do is send out a recall notice and update the onboard computer to change the message so when the sensor fails, it should notify the driver to stop driving, park up and contact the dealer (not that it's ok to continue driving as it currently does).

The beeps are a little concerning. I wouldn't ignore it just because you don't have a warning light on the dash. Do you have access to an obd scanner to run a diagnostics? It's worth purchasing one (get a VAG dedicated scanner). Look up VAG scanner or FVAG, they are around £80 I think.

I would highly recommend buying an OBDII scanner - The one that you can operate from a smartphone is pretty handy. You can pick a VAG specific one for around £80. It provides invaluable info/code reading and helps with diagnosis and clearing fault codes.

As long as the part number matches, you should be fine as the same sensor is used among many models in the VAG group (VW, Audi, Skoda). The only questionable thing is the quality of a chinese part vs a genuine Audi part. You can find a UK supplier from ebay quite easily for around £20 if you don't wan to spend £90 with Audi, and so far the reports on this forum seem to suggest that the aftermarket parts seem fine.

Excellent to hear that the Audi assistance were excellent and sorted the issue! It's just terrible of Audi not to send out a notice to owners of all cars that seem to be effected, as they are aware of the problem! I would advise people to replace the sensor themselves instead of paying silly money for a garage to replace it. It's so easy and only takes a couple of minutes! I highly recommend people buy an OBD11 reader and run a diagnosis at least once a year to see if it picks up any faults, or run it when a warning light/message pops up. It's only because I ran a diagnosis on the day i had the message, got the fault code and researched on the internet that I found this forum and advice! I sorted the issue within a couple of days (didn't drive it until I replaced the part).

I can't believe you got the warning message 1day after you received your car! Personally I would advise against driving the car. The ABS system bricks once it reaches 20 'cycles'. I don't know what constitutes a cycle, but it really isn't worth it. If the garage you bought the car are covering the cost, just buy a genuine part from Audi (it's about £90) and fit it yourself. It's so easy, it took me less than 5 min to replace the part

Have you got the warning message on the dash? If so, and it's under warranty, see book it in with Audi and get them to look at it now, before it bricks the ABS system. Who knows what small print they will use to wriggle out from covering the costs! Even if they did cover the costs, it becomes a much bigger job to change the ABS system than just the sensor..

Hopefully users that have replaced their sensor will update us if and when they fail and give some details of when the part was replaced and if it was an ebay copy or genuine Audi part (and if it's a revised part number). It would be a useful knowledge base for everyone!

It should be criminal that Audi haven't sent out some sort of notification to owners who maybe potentially affected! They also need to update the message on the dash, as it gives the incorrect impression that you are ok to continue to drive without any consequences! I'm also interested to know if people have gone though more than one replacement part (was it a genuine Audi part or a copy from ebay?). Still unsure how the revised 'B' version is any different!

I have no idea. The 'B' is a newer version, but I have no idea what actual difference there is. I don't know if it's better quality internals, or something else. If someone knows, i'd be interested to know too!

The part number on my invoice (from the Audi dealership) is: A5Q0906207B

The fact that you are driving it daily is increasing the risk of bricking the abs system!!! There's more risk that the abs hits another 'cycle' trigger, which it's not possible to do if you don't drive the car. If possible, use another car if you have access, public transport or hire a car while you wait for the part to be delivered.

Apparently the ABS unit bricks once it reaches 20 'cycles' (I'm not sure what counts as 1 cycle), so my advice is do not drive it until the sensor is replaced. It simply isn't worth taking the risk. Even of you by a new aftermarket sensor from ebay for £10-20, it's worth just replacing it

You can easily pick up brand new parts on ebay. Prices range from around £10-80. I can't say if the cheaper parts are any less reliable than OEM parts

Bingo! I agree 100% and i said the exact same thing to the parts guy when I picked up my part 2 weeks ago! He also had a number of people come in for the same part. I think we should all contact Audi customer services and tell them that they need to update the warning message on the dash because it is incredibly misleading!

The message should stay on permanently. If the message has popped up briefly and disappeared, then my guess is that it won't be long before it fails. Get a replacement sensor now and keep it in the glove box ready to replace once it does go. You don't want to be in a position where you are too far from a dealer to get the part or you have to wait days for it to be delivered - driving too long with the error message will brick the ABS servo. Better to spend the £80-ish (assuming if you go for a OEM part) now or a few thousand £'s later!

I also had a problem with the sensor yesterday on my 2018 A5 Sportback. Here's my post that people my find of interest:

Ok, so an update.... I called the local Audi dealer and checked if they had the part in stock and they had 1 left (part number ending in B) which I reserved. It cost me £84.42. I got there and spoke to the parts guy and asked if they had many people come in for this part and he said yes and one person came in yesterday with a similar problem. To told him it's naughty from Audi as they/car dashboard are giving misleading information and he agreed. Anyway I got home and replaced the part - it's so easy that nobody should ever need to pay anyone else to change it. It took me 2 minutes (if that)! Shame on any garage charging more than 5min labour! Anyway, I started the car and so far I haven't had the warning light come on, but then again I only reversed a few meters back and forward in my drive. I will have to take it for a longer drive later when the roads are clearer to confirm that it's sorted! Looking back, the fact that the start/stop function was intermittent for a while maybe was a sign that there was a fault/sensor was failing, before the actual dashboard gave a warning! I would highly recommend getting a obd scanner too (which I recently purchased a couple of months ago) and it really helps to narrow down the issue and search on the net for advice - that's how I found this forum! Many thanks to all those who have contributed to this and the other main thread!

It was by pure coincidence that I was driving to someone's house yesterday to run an Obd11 scan on their car when my warning message popped up. I drove the car twice (there and back) and did around a total of 15 miles! As soon as I got home, I ran the obd11 scan on my car and got the fault codes: C11EC04 - Brake Booster pressure sensor faulty U041500 - Invalid Data received from Anti-lock brake system control module I'm not sure if the 2nd fault code is triggered due to the 1st? I searched online and found this site and THANK GOD i did, as the results could have been extremely expensive if I assumed that it was ok to continue to drive (as per the warning info saying that I can 'continue driving'). To say i'm livid with Audi and the way they have washed there hands with the issue from other owners is an understatement! If they have received lots and lots of complaints from people with the same fault, then they really need to send out a recall notice! Fingers-crossed I haven't bricked my abs system! I curious to know that there is some of of 'counter' in the ABS system and if you reach 20 cycles (I think), then the ABS system bricks and you are left with a huge bill to replace. What would constitute 1 cycle and if I replace the brake servo pressure sensor (run obd11 and clear the faults), does the counter reset to zero or permanently log the fault?

Thanks Steve Q! So it won't be an issue if can only get my hands on the part ending in A? I wonder what the actual difference is between the 2? Better design/engineering internally? What about the brand/manufacturer? The price varies quite a lot £10-£80!

Hi mate, I recommend '4rings' who are based in Dartford. I've used them before. They are not the cheapest but are excellent!

Hi guys, I've just had the same warning come up on my A5 Sportback (2018) 2.0 TFSI. I'm going to get myself a replacement brake servo sensor, but does anyone know if there's a major difference between part numbers: 5Q0906207 and 5Q0906207B ? As far as I understand the 5Q0906207B is backwards compatible but I don't know which part number I should be going for! Also do people recommend going for an OEM part (VEMO) which seem to cost around £70 or a generic brand which cost around £10-20?! Thanks