Peugeot 408 Headlight Range Control Error

I have the same 408 and had something similar last year. The lights were all over the place. Did you try to run an adaptation via diagnostic tool?

Yes, I tried a basic setting with the diagnostic tool, but the adaptation failed. Was that what happened to you?

Exactly the same. I'm betting you have a defective servomotor in the headlight unit. I had to bring it to a workshop and pay around 1040€.

Thanks, that confirms it. Given the failed adaptation and your experience, a defective servomotor seems likely. I'll book it in to my local shop to get it sorted. Thanks!