Micra Mirror Heating Fault

Sounds like an issue in the mirror heating circuit. With the error code and both mirrors failing, I'd guess a common failure point. Have you checked the wiring and plugs to the heating elements? Could be a bad cable or corroded connector.

I checked the wiring and connectors inside the mirror housing, but I didn't take apart the door to trace the wiring further. Could the problem be deeper in the car's electronics, or is it more likely in the mirror assembly?

A bigger electrical fault is possible, but less likely given the error code points to the mirror heating circuit. A defective cable or plug near the mirror is still most likely. If you're not experienced with car electrics, get a workshop to diagnose it. They'll have the tools to trace the wiring and find the fault. Expect around 95€.

Thanks, I'll get it checked by a workshop to avoid more damage. Appreciate the help!