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Author Topic: GTI 8.5 first impressions  (Read 3628 times)

Offline fredgroves

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Re: GTI 8.5 first impressions
« Reply #10 on: 01 February 2026, 21:46 »
The OSF you mention is usually called the 5F controller. It's the "brains" of the infotainment system, a computer that lives behind the glove box.

Not seen anyone say it's causing HK problems, it has been known to be the cause of the various bongs and crashes on the Mk8 though.

It's an expensive part, £3500...unless there is a TSB for it they aren't going to even think about touching it. In fact the dealer isn't allowed to do any warranty work without the VW computer authorising them... No guess work or initiative allowed.
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Current: Mk8 GTI DSG, Adelaides, DCC, HUD, HK, Winter Pack, Rear Camera.. Aka "HMS Weasel"

Gone: 2017 Mk7.5 GTD,manual, NavPro
Gone: 2014 Mk7 GTD, manual, NavPro, DCC

Offline candywhite12

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Re: GTI 8.5 first impressions
« Reply #11 on: 04 February 2026, 17:12 »
and some pics following full ceramic treatment by hand  :laugh: Had to let it sit for a few days but worth the wait








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Current: GTI 8.5, Moonstone Gray, 5dr, Black Estorils 19''. pan, DCC
Wife's: mk8 TSI 1.5 RL, 5dr atlantic blue, DSG, Norfolk 17", pan s/r, leds
Son's: mk7.5 TSI 1.4 RL, 5dr tornado red, DSG, Singapore 17", pan s/r, leds
Before: mk6 GTI 5dr candy white, DSG, Monza Shadow 18", s/r, bi-Xenons, DCC
Even before that: mk5 GT 5dr tornado red, manual, s/r
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