Jade Z

On 9/28/2020 at 10:26 AM, Chris J said:

Big Shout Out to this forum and to Simon Ryder👍👍

Like most on this thread I hadn't used my Audi A4 Avant 3.0TDI Sport 66 plate much over the last 6 months. It's our second car and only done 10k - So like a new car.

Yesterday after using the car for first time in a couple of months the brakes were a bit sticky but freed off after a few miles. To be expected sometimes after a lay up. About 20miles on I got the Brake Servo:restricted warning alarm. I Drove to my destination about 10 miles further and parked. On starting up to travel home The Brake Servo & auto/start Stop warning showed. I drove home gently and parked the car.

Luckily I found this thread and first thing this morning went to my local Audi parts department and purchased the Brake pressure sensor 5Q0906207A for £74.10. The old sensor was 5Q0906207 but the new one by a different manufacturer has an A on the end. The Audi parts guy confirmed it was the correct part. I informed him of this thread and potential to damage the ABS system. He said they stocked a few sensors so that would suggest they get used often🤔

Following Simon's guide I had the old sensor exchanged in a couple of minutes. Small flat screwdriver to unclip the side catches and pull back the gray locking toggle on top of the electrical sensor. Pumped the Brake pedal a few times and started the car. The Brake Servo restricted alarm disappeared but the autostart stop disabled warning still showed. I turned off the engine and waited till everything was off and dash blank. Then restarted the car and the auto start stop warning also disappeared. So success thanks to this thread and Simon's guide. It does feel like a win and no damage to the ABS system so over the moon👍😁

If you have a 66 plate Audi and come across this thread I would seriously consider swoping the sensor before you have a failure and possible bill for an abs system pump.

Thanks again

Chris

Hi All,

Just to update, I purchased a brake pressure sensor from Audi dealership for £74.10 and replaced the broken one in a couple of mins. All the error messages were gone. Big thank you to this forum and to Simon Ryder for the instruction. Clearly this is the way to do it when the error messages first appear. 
 

Please take care everyone. 
J

On 9/19/2020 at 7:37 AM, C87 said:

I have had the exact same problem, thanks to this post I didn’t continue driving and may have  saved a costly repair to my ABS system! 
I checked the sensor data using VCDS and it showed an error on the brake booster pressure sensor. Replaced the part with a genuine part from Audi Edinburgh (£74.10) and now all is well, phew! Same part number as mentioned previously and was delivered in 2 days.

If it helps, my car is an A4 Avant Ultra 190 S-Tronic with around 80k miles.

Thanks again!

Hi C87, 

Just to check whether the booster sensor you replaced is the same as the part photo that Simon showed in his post?

I am still waiting for my appointment with Audi and it’s frustrating as I can’t even use my car. I am tempting to replace it myself now. 
Look forward to your reply. Thanks.  
J. 

On 9/10/2020 at 9:09 AM, Dazzh said:

Hi @Jade Z & @Danboy1973

I had the same problem and took it to AUDI Glasgow who initially said £2700 for sensor and ABS, 

I explained about the car just being over just 3 1/2 years old, low mileage, bought new and also serviced by them. They eventually contacted AUDI who paid £1700 towards the bill.

I also complained direct to AUDI about this becoming an emerging issue however this fell on deft ears and all that was offered was 10% off a service.

I would chase it up as I don't see any reason why AUDI would not contribute to your bill. 

Best of luck

Hi, I called Audi and there is a 4 weeks wait before they can make a diagnosis. It will cost £99 simply to check it. From what you guys described I might be better leaving the car untouched until then. I did test drive it a bit that day thinking the fault could be due to rust in the brakes as it was not used for a couple of weeks but hope it hasn’t done much damage to the ABS. I agree that it is either Audi’s design fault or they are using a highly unreliable part in the critical components compromising safety. I agree as owner we must voice our concerns/complaints particularly it happened to so many of us. God knows how many others have had the same problem who are not connected to this club. Will give you an update when mine is diagnosed and repaired. Definitely will write to Audi to complain. 
 

Please take care
J

Hi everyone, I have an A4 Diesel 2.0 2016. Exactly same problem: parked in the drive for a couple of weeks not using. I drove today and the brake servo/start/stop error messages appeared. The brake felt a bit funny too. After seeing everyone’s post, it seems clear to me that this can either be a design fault or a poor sensor with only 3-4 year’s life span. Just can’t believe it happened to Audi. As it’s outside warranty I guess there is nothing we can do but pay for the repair. Frustrating...