Active Hood Fault Triggers Q3 Safety System Alert

As a hobby mechanic with some experience working on VAG cars, I had a similar car electronics issue with my 2020 Audi Q5. The car sensor system showed identical symptoms, active hood warnings and airbag light staying on. The crash detection system in these models relies heavily on acceleration sensors working correctly. After diagnosing the system fault through OBD, it turned out the acceleration sensor was defective, triggering false positives in the safety systems. The repair involved: Complete diagnostic scan, Replacement of the faulty sensor, Resetting the system, Recalibrating the active hood mechanism Total cost was 315 Euro including parts and labor. The workshop needed about 3 hours to complete everything. To provide more specific guidance for your case, could you share: Have you noticed any impact damage near the front sensors? Did the warnings appear suddenly or gradually? Are there any other warning lights active? Have you had any recent work done on the hood or front end? These details would help determine if your issue matches what I experienced or if it might be something different in the car safety system.

Last service was at 95000 KM at official dealer. Thanks for sharing your experience. After reading your reply, I checked for visible damage around the front sensors but found nothing obvious. The warnings appeared suddenly during normal driving without any impacts. No other warning lights are active besides the airbag. The pedestrian safety system seems to have triggered without cause. Looking at the car sensor diagnostics again, the error code specifically points to the hood mechanism rather than the acceleration sensors you mentioned. I will get it checked at a workshop since the impact sensor system is a critical safety component and I want to ensure everything works properly.

Thanks for the additional details about your Q3. Those symptoms do sound different from what I encountered, especially since your error codes point directly to the hood mechanism rather than the acceleration sensors in my case. With the system fault appearing during normal driving and no visible damage, this could indicate an issue with the hood latch sensors themselves or their wiring harness. The car electronics might be detecting a false trigger condition in the pedestrian safety system. Based on my repair experience and subsequent research, here are some potential causes to have the workshop check: Faulty wiring connections to the hood sensors, Corroded or damaged hood latch connectors, Misaligned hood latch mechanism, Internal failure of the impact sensor unit My suggestion would be to have them focus on the hood latch assembly first, as this is often the source of these warnings when there is no accident damage. The diagnostic process should be simpler than my sensor replacement case. Since this affects critical safety systems, going to an authorized workshop is definitely the right call. They will have the proper diagnostic tools to pinpoint whether its the sensors, wiring, or mechanism causing the fault.

The sensor diagnostics seem to be pointing us in the right direction. Based on your experience with a similar but different issue, I appreciate the detailed explanation about potential causes. Seems my problem is more focused on the hood mechanism itself rather than the acceleration sensors you dealt with. Will book the car in next week for a thorough diagnostic of the car electronics and collision detection systems. The fact that the pedestrian safety features triggered without cause is concerning enough to justify getting it properly checked by specialists. Could be as simple as wiring or connectors like you suggested, rather than a complete sensor replacement. Hoping the repair costs stay under what you experienced at 315 Euro, but safety comes first with these advanced protection systems. Thanks for the detailed responses. The comparison with your case helped narrow down where the actual problem might be. Will update once the workshop identifies the specific issue with the hood mechanism.