Smart Roadster Hood & Airbag Warning After Service

Having experienced similar symptoms on my Smart ForTwo (2007), I can relate to this concern. The active hood fault combined with the airbag warning typically indicates an issue with the crash detection system or its related impact sensors. In my case, the problem emerged after routine maintenance where technicians had to remove the front bumper. The issue was a disconnected wiring harness for the pedestrian safety system, specifically the hood deployment sensor connector that got dislodged during the work. The repair involved: Complete diagnostic scan of the safety system, Recalibration of the impact sensors, Reconnecting and securing the wiring harness, Clearing the fault codes While the fix was straightforward, these warnings should never be ignored as they affect critical car safety features. The active hood is part of the pedestrian protection system, designed to reduce injury severity in case of an impact. Given that your warnings appeared after mechanical work, its likely a similar connector issue rather than failed sensors. However, the car electronics need proper diagnosis to confirm this. A qualified technician with the right diagnostic tools should inspect the system before driving long distances.

Thanks for sharing your experience. This really sounds similar to what happened after my Roadster got serviced last month. The mechanic reconnected some loose cables near the crash detection sensor and recalibrated the safety system which fixed it. Could you remember roughly how much the diagnostic and repair cost in your case? Also wondering if you had any issues with the car safety systems since getting it fixed?

Good news, the Active hood fault on my ForTwo hasnt returned since the repair. The collision detection system and all car safety features are working perfectly now. I got the work done last month and paid 315€ to replace a faulty acceleration sensor that was part of the pedestrian safety system. This included the full diagnostic scan and recalibration. The hood latch and related car electronics have been trouble-free since the fix. The initial symptoms were quite worrying, but having the right diagnosis made all the difference. Worth noting that proper sensor calibration is crucial for these safety systems to function correctly.

Thank you everyone for the helpful input. I finally got the issue resolved this week. The mechanic found that the impact sensor wiring had come loose during the previous service. After a thorough diagnostic scan of the safety system, they properly secured all connections and recalibrated the sensors. The total cost came to 180€ which included the diagnostic work and recalibration. Much better than having to replace any crash detection components. The airbag warning and Active hood fault messages cleared right away and havent returned since. Really glad I checked here first, saved me from worrying about more serious pedestrian safety system issues. The car is running perfectly now with all safety features working as they should.