SQ8 Parking Assist System Failure: Real Owner's Report

Had a similar issue with my 2020 Q8. As someone with basic car maintenance experience, I initially thought it was just a software glitch, but it turned out to be more complex. The faulty wiring between the control module and proximity sensors was causing the parking assist system to fail completely. The obstacle detection system showed the same symptoms, no response, no warnings, complete failure of all parking related functions including the blind spot sensors. Took it to my regular workshop where they diagnosed a damaged plug connection to the main sensor array. Apparently, water had seeped in and corroded some connections. The fix was straightforward, they replaced the wiring harness and weatherproofing components. Total repair cost was 95 Euro and took about 2 hours. Before suggesting specific solutions, could you share: Have you noticed any water exposure or recent car washes before the issue started? Are there any visible damages to the sensors themselves? Does the fault appear immediately when starting the car or after driving for a while? Which specific error code is stored in the system? This information would help determine if youre dealing with a similar connection issue or something else entirely.

Thanks for the feedback. My odometer shows 118764 KM and had the last service about 2 months ago. No apparent water damage to the parking sensors that I can see. The fault appears right at startup and stays constant. The error code reads P0467. I did notice this started happening after a particularly cold spell, if that helps. The rearview camera and all other parking assist features remain completely unresponsive, though the blind spot sensors still work normally. The dealership wants to charge a 180 Euro diagnostic fee just to look at it. Before going that route, I wanted to check if theres a known issue with these systems in cold weather, since timing seems suspicious. Multiple ultrasonic sensors failing simultaneously seems unlikely unless its a central system problem.

Thanks for providing those details about your SQ8. The cold weather timing matches what I experienced, my parking assist also failed during a winter cold snap. However, in my case, it turned out the control module itself was the culprit, not the ultrasonic sensors. The P0467 code typically indicates a control module communication error, which aligns with your symptoms, total system failure while blind spot sensors remain functional. This points to a central system issue rather than individual sensor failures. My repair required a control module replacement, as the extreme temperature had caused internal component damage. The fix was more expensive than the wiring issue I initially suspected, around 450 Euro plus programming. However, it completely resolved the parking assist problems, and the system has worked flawlessly since. The rearview camera and obstacle detection systems being unresponsive while blind spot monitoring still works is a telltale sign of a control module issue. Based on the identical symptoms and error code, Id lean toward this being your problem too. While the diagnostic fee seems steep, getting it properly checked is probably worthwhile given the complexity of these systems. In my experience, trying DIY fixes on the parking assist electronics often leads to more expensive repairs later.

After comparing your experience with mine and considering the identical P0467 code, I think youre right about the control module being the likely culprit. The fact that the blind spot sensors still work while the parking assist and rearview camera are completely dead matches the pattern youre describing. The cold weather correlation makes sense now, and Im less concerned about the multiple sensor failure theory. Given that the radar sensors and parking assist systems are managed separately, the selective failure pattern fits with a control module issue. I appreciate the detailed cost breakdown. While 450 Euro plus programming is significant, at least I know what Im potentially looking at. The 180 Euro diagnostic fee is still frustrating, but I guess its better than attempting fixes blindly and possibly making things worse. Think Ill bite the bullet and schedule the diagnostic. The complete loss of parking assist functionality is becoming a real hassle, especially since I rely on those features daily. Thanks for helping me understand what Im likely dealing with. Will update once I get the official diagnosis.