Has anyone got ideas or solved this problem? The wife has a 2016 Octy Scout (Mk3) manual transmission and there a noise developing in the rear drive train when accelerating through maybe 1500rpm or so. It's like a rasping/rattling sort of noise, like you would get if you were in too high a gear. I've got it in the air and I can find nothing at all, the prop and rear driveshafts look perfect (the balance weight it still on the prop, even though this is not a vibration issue) and also over the years, I've changed the Haldex oil twice together with the filter. I have wondered if it was the rear prop coupling as lots of posts report cracking of the rubber. But look closely and you see it's not cracking, just rubber flashings during moulding with little rips. (most folk who replace this coupling find that it isn't cracked when the look closely after removal). I see nothing, no smoking gun as such. It's developed over the last 2 years maybe, never did it when we first got the car. It's annoying and I'd love to find a cure. I'm still thinking the coupling may be deteriorating though and it has a metal flywheel type ring moulded on the periphery. Any ideas, must be common amongst the Golf/TT/Seat/A3 stuff with the Haldex 4WD....?

Edited 9 September, 20259 Sep by JulianS

A rasping rattling noise sounds more like a heat shield issue??

7 hours ago, skomaz said:

A rasping rattling noise sounds more like a heat shield issue??

That's a fair comment, I shall examine tomorrow. Thanks.

Just to finish this one off, I decided that it could only be the coupling (harmonic damper part) and bit the bullet and got a new one. Be careful, lots of different part numbers available so have your registration handy. Anyway, by lowering the rear of the exhaust and with some careful thought and a tyre lever I was just able to slip it in - was tight. If that didn't work then I think the next option is to lower the centre prop bearing but that involves loads of heat shields and a probable complete exhaust removal. (much bigger job) Anyhow, test drive and the noise is gone.