Peugeot 407 Active hood fault

Sounds like a potential issue with the active hood system. The error message and airbag light usually point to a problem with the crash detection system. Given that the spring actuators are triggering, it suggests a false signal. Have you had any work done recently that might have disturbed the sensors, perhaps around the hood latch area?

No, no recent work at all. So you think it might be related to the car sensor responsible for crash detection? Where exactly is that located, and is it something I could potentially check myself without causing further issues?

Yes, the acceleration sensor is the prime suspect here, especially given the symptoms. While you could try to locate it, I wouldn't recommend fiddling with it yourself. Messing with safety systems can be risky and could inadvertently deploy the active hood or airbags. Better to have a professional diagnose it properly to avoid further complications and costs. The eventual repair cost will be around 315€.

Thanks for the advice! Sounds like a trip to the workshop is definitely in order. Glad to have a clearer idea of what's going on, and what to expect in terms of repair. I will keep you posted.