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Author Topic: GTI 8.5 first impressions  (Read 12707 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

Offline miromen

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Re: GTI 8.5 first impressions
« Reply #12 on: Today at 19:12 »
Quote from: candywhite12 on 01 February 2026, 11:07
fair enough, quoting from my Audio post then:

got intermittent sound twice in a week, music cuts, thought it was my usb stick and my music, nope, same with radio and spotify.  Had to hard reset the system.  Some members in other forums mention having to change the OSF Control Unit (part code 572035876G), others cite that is happens because of CarPlay or Android Auto.

As if the disappointment that for such a lovely car, such a poor audio system choice wasn't enough...

Anyone else experiencing this?

Quote from: SRGTD on 31 January 2026, 18:23
Quote from: candywhite12 on 31 January 2026, 13:43
makes for an interesting read, cheers mate.  I'll also post in car audio section as im facing some issues with intermittent sound now and then

I’m not sure too many mk8.5 owners visit the car audio section of the forum so probably worth posting your details of your audio issues here as well.
Hey how did you get on with the sound?
I have a new GTI 50 and I have the same problem with the sound dropping out.
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