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Thanks all - just replaced the brake booster pressure sensor on my A4 B9 - latest Part # 5Q0 906 207 A - hope it lasts longer than the original! My car experienced the problem Brake Servo Restricted + Auto Stop / Start Disabled today at 3pm, and thanks to this website I'd found the problem, and fitted the replacement part by 5pm. The result = problem solved. :-) Excellent.

Welcome to the forum, you'll find the members on here are a friendly and helpful bunch 🙂 Lovely looking a3 you have there 👍

Hi Arron, after owning three diesel cabs equipped with DPFs and having covered 750k between them I have got a pretty fair idea of what goes on, they are all different the worst one being my 2.2 Titanium x sport Mondeo, one night I was late going to Gatwick for a pick up so I had become stuck on one of our local B roads, so the car had just started a regeneration I threw a left up a side road, there was some poor soul on the grass verge on the corner letting his dog take a leak, as I looked back he was completely engulfed in a large cloud of whitish grey smoke, basically three days worth of ash, the car normally did this on the motorway in small puffs when accelerating it was quite spectacular in slower motion, the exhaust pressure is high on the motorway which evacuates the ash, same pressure when booting it up a side road. Steve.

Sounds good to me 👍

I'm very keen, I used to go every year as it's local but not been in the last few years. I do love seeing the camper Vans and beetles 🙂

I just want to thank this Forum for the information given, I replaced my sensor today & both faults have disappeared !