RS5 Radar Sensor Failure Causing Multiple Errors

Had a similar sensor malfunction on my 2016 S5. The safety systems started failing one after another, adaptive cruise stopped working, followed by forward collision warnings going offline. The root cause was a dirty front radar sensor behind the grille badge. Road grime and salt had accumulated, triggering multiple system failures. The sensor failure affected all driver assistance features that rely on the front radar. This is generally not a serious issue if caught early. The repair involves: 1. Deep cleaning of the sensor area 2. Testing sensor functionality 3. Performing proper radar calibration 4. Clearing all related fault codes Important note: Even after cleaning, the sensor must be recalibrated in exact factory specs. Without proper calibration tools and procedures, the safety systems will not function correctly. Make sure any shop you choose has Audi-specific diagnostic equipment for sensor calibration. The front radar is critical for multiple safety systems including emergency braking and adaptive cruise. While the car remains driveable, operating without these safety features is not recommended long-term. Key is finding a shop with experience in radar calibration and Audi diagnostic systems. The sensor cleaning itself is straightforward, but proper calibration requires specific expertise and equipment.

Thanks for the detailed explanation. After dealing with similar automotive sensors issues on my RS5, I can confirm this is exactly what happened. The adaptive cruise control completely failed and triggered multiple warnings. Had it fixed at a certified shop that handled the radar calibration properly. Would you mind sharing roughly how much you paid for the complete service? Also curious if you experienced any sensor malfunction again since having it repaired? Just want to make sure the fix holds up long-term before taking my car in.

After getting the radar sensor cleaned and recalibrated, my S5 has been running perfectly with no repeat electronic issues. The total service cost was just 45 Euro since the radar sensor only needed a thorough cleaning, no parts replacement was necessary. The automotive sensors have remained fully functional for over 8 months now. All safety systems including adaptive cruise and collision warning are working as intended. The key was finding a shop that properly diagnosed the radar sensor being dirty rather than jumping to replace expensive components. I do periodic checks of the front grille area now to prevent future sensor failure. Regular cleaning helps maintain optimal performance of these advanced safety systems.

I finally took my RS5 to get checked out based on the advice here. The total bill came to 180 Euro, higher than expected but worth every cent. The shop found heavy buildup on the radar sensor causing the electronic issues. They did a complete cleaning and professional radar calibration. The automotive sensors are all working perfectly now. Adaptive cruise control kicked back in immediately and all warning lights cleared up. Such a relief after dealing with those constant error messages. Definitely learned my lesson about sensor maintenance. The technician showed me exactly where to check for buildup that could cause sensor malfunction. Will be doing regular checks now to avoid future issues. Much better experience than my previous mechanic who wanted to replace the entire sensor unit for 1200 Euro. Good thing I got a second opinion from a shop that actually knows radar calibration procedures.