Just took delivery of my brand new 63 sline sportback a3 and driving home start stop was working fine .. Spent some time at home going through car settings .. Took for another drive .. Start stop now unavailable .. Do u think this could be battery voltage related ? As car aint had a good run yet ? Also when Keyed off cooling fan stayed on for about 5 mins and a very hot smell was evident .. Then car shut down .. Is this the dpf ?