VW Bora Multiple System Failures Due to Sensor Issues

I had a similar issue with my VW Golf from 2002, and being fairly experienced with basic car maintenance, I decided to investigate before heading to the workshop. The symptoms matched exactly what you describe, warning lights, speedometer issues, and multiple system malfunctions. The radar sensor was showing errors in the diagnostic readings. After inspecting the front of the vehicle, I noticed the sensor area was covered with road grime and debris. Took it to my regular workshop, where they confirmed the radar sensor was simply dirty and needed proper cleaning and calibration. The entire service cost 45€, which included cleaning and electronic system checks. The adaptive cruise control and other sensor-dependent systems started working perfectly after the maintenance. Before suggesting more specific solutions, could you provide: Engine type and size, Current mileage, When did these symptoms first appear, Any recent weather conditions or road works exposure, List of specific warning lights that are active This information would help determine if your issue is similarly straightforward or if there might be a more complex sensor failure or electronic issue requiring attention.

Last service was 2 months ago at 31892km. After reviewing similar cases, I checked the front sensor area per your suggestion. Unlike your case, cleaning didnt resolve the issue. The adaptive cruise control system still shows multiple error codes and driving assistance features remain disabled. The warning lights appeared suddenly during normal driving conditions. The sensor malfunction seems more severe, possibly indicating an electronic issue rather than just dirt accumulation. The workshop visit might be unavoidable at this point since the basic troubleshooting didnt work. Thanks for confirming your repair costs. Will update once I get a proper diagnosis from the workshop.

Thanks for the update. Since cleaning didnt resolve the issue like in my case, it definitely points toward a more serious sensor malfunction. In my VW, I actually had a similar follow-up problem months after the initial cleaning fix, turned out the radar sensor itself had developed an internal fault. The workshop diagnosed a failing circuit board inside the sensor unit. The repair cost was significantly higher at 380€ for the new sensor plus calibration. The constant error codes and disabled safety systems were nearly identical to what youre describing. The sudden onset during normal driving is a typical sign of sensor failure rather than environmental interference. When adaptive cruise control and other assistance features completely shut down like this, its usually the sensor hardware itself rather than just calibration issues. Make sure the workshop performs a complete radar calibration after replacing any components. Improper sensor alignment can trigger similar system malfunctions even with new parts. Let us know what the workshop finds. This kind of sensor malfunction data helps others troubleshoot similar safety system failures.

Since basic troubleshooting didnt resolve my sensor issues, I took the car to a certified workshop today. They confirmed what was suggested, a faulty radar sensor causing multiple electronic issues across vehicle systems. The diagnostic test showed the sensor had an internal circuit failure, similar to what you experienced. The total repair estimate is 425€, including the new sensor unit, radar calibration, and system diagnostics. While higher than your repair cost, it seems reasonable given current parts prices. The workshop explained that proper calibration of the new automotive sensors is critical for the driving assistance systems to function correctly. The technician mentioned these electronic issues are becoming more common in aging vehicles as sensor components reach their service life limits. They will perform a complete system check after installation to ensure all adaptive cruise and safety features are properly restored. Will schedule the repair next week and update the forum with the final outcome. Your shared experience helped identify the likely cause and set realistic cost expectations for the sensor replacement.