Rich867

Four months on now and sensor seems ok.  I don’t think it is related but I am getting three beeps which sound like they are coming from the back seats/boot area.  No warning messages or lights on dash.  Only happens when the car is moving.

1 hour ago, CobboldSt said:

Hello all,

Thank you all for providing your insight to this issue. I managed to change the sensor myself as per Simon’s helpful guide.

I test drove my 2017 A4 TFSI for a couple of miles and the fault did not reappear. The following day, upon startup, the fault reappeared; has anyone experienced this?

Ben

I changed the sensor a couple of months ago, it was the £20 one off eBay and not had the warning since. Stop start is working fine too since the change. Only thing I noticed was that my brake pedal was really stiff just after I changed the sensor but then went to normal after the engine was running which I put down to the pressure equalising in the system.

14 hours ago, Jaime A5 Quattro said:

Well here’s a quick update I’m pleased to tell you all my cheap part is still working as it should done roughly just over 1200 miles. I will update if anything changes. 

Had my £19.99 part from eBay in for 4 weeks now and so far so good.

3 hours ago, PHB said:

Where did you find a sensor for £10, the best price on ebay I found was £69.

I paid £19.99 the seller was called parts-for-german-cars.  Listing comes up if you search Audi A4 B9 Brake Booster Pressure Sensor.  There’s a bit where you can check the compatibility with your car on the listing as well. There were some cheaper ones but not all were compatible with my model.

Yes, quick press for unlock, long press and it opens

17 hours ago, kh904 said:

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!

I had a look through earlier bits of this thread and someone mentioned the B might be the improved version.  Makes sense as this seemed to impact cars from a certain period, 16-18 was mentioned.  If this is the case the B would make it easier to diagnose issues but does beg the question why they didn’t do this as part of a recall or service programme.  The other thought was whether the eBay versions are more or less robust if they are based on the original, has anyone gone through more than one replacement?  If so how long did the first replacement last?

On 5/19/2022 at 10:13 AM, kh904 said:

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

A5Q0906207B

 

 

What is the difference with the B version, I got mine off eBay and I used the compatibility checker on the listing and it just had the numbers.

On 5/9/2022 at 12:28 PM, Bri H said:

Not sure if this is allowed but here is the part I got off ebay "parts for German cars"  https://www.ebay.co.uk/itm/AUDI-A4-B9-50-TDI-Brake-Booster-Pressure-Sensor-5Q0906207-5Q0906207A/234133225811 looked no different to the part I removed. Yes I understand it could be a very good Chinese copy, but the add does they do not use these. UK based and 2yrs warranty, part arrived in 2 days. Also found the part on Amazon for £12.99.

I bought one of these off eBay, arrived in two days and just fitted it this afternoon.  Brake pedal was stiff when I went to start the car but once car started presumably the servo kicked in and worked normally.  Took it for a spin to check the brakes were working and seemed fine.  Will be going on a longer journey so will report back if I encounter any problems.

Hi, I picked up my Audi 2016 2.0 TDI Avant today from a non Audi dealer.  I got the Brake Servo restricted message momentarily but it hasn’t come back. Stop start was working fine, drove about 150 miles since the message appeared.  Is this warning supposed to stay on permanently or does it come back from time to time.