DS3 Turn Signal Fault

I also own a DS3 and had a similar issue with the turn signal. Did you check the cable and plug connection of the component? That was the problem in my case.

Thanks for the tip! Where exactly should I be looking for this cable and plug connection? Is it easy to access?

Yes, the cables and connections of the turn indicator are known to be defective. Given the error stored in the error memory and all the symptoms you described, it's likely the cause. However, I'd recommend taking it to a workshop. I paid around 95€ to get it fixed, so it shouldn't be too expensive.

You were spot on! Took it to the shop, and it was indeed a faulty cable connection. 95€ later, all sorted. Thanks for pointing me in the right direction!