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So I can buy an SPS from anywhere at any time? It doesn't need to match my car, or have nay software loaded onto it? If that's the case it's good to know.

Left field thought, but could it be an issues with the BCM (body control module) or similar?

Not sure how I would test that. Are the lights powered directly from an output on the BCM? Could that explain why I see 12v at the light? That could be a very low current monitoring voltage.

If you ask AI this in different ways you get opposing answers: sometimes it says it makes ride harsher, other times more comfortable. That's AI for you

I have made the change twice. Both to OZ (leggera and ultraleggera). Once on a 997, with the same tyres switched over, and the ride was better.

And on my Clubsport S and the ride is leagues better BUT on this one I went from 19 prets to 18 OZs saving 2kg a corner, and had new tyres so those two probably explain much of the improvement.

Have you changed the tyres too? There is a lot of sidewall stiffness variation between makes - even with same load rating.

I’ve replaced my (heavy) standard Parker’s with aftermarket alloys approx 2kg per wheel lighter. Same size 18” and width as the originals.

Much has been made of the virtues in reducing unsprung weight.

But the only discernible effect for me is a rougher ride on most surfaces.

My car has DCC and each of the settings seems to give a ride about 10% rougher than with the heavier wheels.

I’ve searched this and other forums before posting as there doesn’t seem to be any comment other than on AI which suggests a rougher ride may indeed be the result of a lighter wheel causing the suspension to react more eagerly (sensitively?).

Any opinions or experience?

Quote from: SRGTD on 13 November 2025, 15:21

Quote from: Rudedog on 13 November 2025, 12:19

Mine has always come on when unlocking when it's getting dark but the CH feature has only ever worked by pulling the headlights before getting out (you set the length of time on in the Info menu) - this really annoyed me because I used to have it automatically in my Mk5 - the only advantage of doing this way is that I avoid all of the 'you've left your lights on' remarks when locking up in car parks.

That’s the way any recent VW’s I’ve owned have worked too. And yes, CH/LHalso worked automatically in the mk5 I owned many years ago.

@HonkyGonk; did you buy your car new or used? If the the latter, then maybe a previous owner changed the CH/LH functionality by changing the coding so it worked like earlier generation VW’s. I seem to remember reading many years ago that any bespoke coding changes an owner has made get over-written if there’s an official VW software update, so I suspect that maybe what’s happened with your CH/LH functionality.

@SRGTD; I bought it second hand so I guess there was no way to know whether it had any bespoke coding - if it did, this was the only thing was changed.

Do you think there's any validity to the door actuator fault being a cause?

Sorry, I’ve no idea if a faulty door actuator could be the cause.