Peugeot 108 Lighting Fault

I recall a similar occurrence with my previous vehicle, an Opel Astra. The symptoms align with what you've described – erratic illumination behavior coupled with diagnostic trouble codes. The root cause was traced to a compromised wiring harness leading to the headlight switch. Inspecting the integrity of your cabling might prove worthwhile.

Thanks for the info. When you say compromised, are you referring to the cable or plug connection?

Indeed. More specifically, the malefactor proved to be corrosion infiltrating the connector at the base of the headlight switch itself. While a superficial examination revealed no obvious defects, closer scrutiny unveiled the anomaly. Consulting a qualified technician may prove advantageous.

Took it to a workshop. The cable or plug connection of the component was indeed defective. Repair cost: 95€. Thanks for the help!