Q5 - Stop/Start system fault + brake servo restricted

[Pauline S.S.]

I've put a new sensor on and problem still there.      How serious could this be?  It's now booked into my Audi garage for a diagnostic.  

[Steve Q]

Keep us posted on how you get on. Stop/start issue could be caused by a failing battery. 

Could the replacement sensor be faulty? 

[Pauline S.S.]

It's only just (3 weeks ago) had a service and MOT.   Nothing picked up then.      I'll see what happens on Tuesday.  Diagnostic is going to cost £150 before anything else.  No choice really now than to go ahead with this.    Many thanks Steve Q

[cliffcoggin]

See this 

https://www.audiownersclub.com/forums/topic/13415-brake-servo-restricted/#comment-47826