Audi A5 ABS & Traction Control Issues Fixed Here

As someone with some hands-on experience, I dealt with a very similar issue on my 2010 A4 2.0T last year. The symptoms matched exactly what youre describing, ABS light, traction issues, and vehicle stability warnings all active at once. After running a diagnostic scan, my workshop identified a faulty ABS control unit as the root cause. The steering angle sensor readings were also inconsistent, initially making them suspect that as the culprit. However, the comprehensive testing revealed the control unit itself was the actual problem. The electronic stability system was completely restored after replacing the control unit. Total repair cost including labor was 1000 Euro, and the fix has been solid since then with no recurring issues. Before suggesting this might be your exact issue, it would help to know: Have you noticed any specific driving conditions when the problem occurs? Are there any other warning lights active besides ABS? Did you get specific error codes from the diagnostic scan? Has there been any recent work done on the braking system? Since these systems are safety-critical, its important to get this addressed properly. A malfunctioning ABS and stability control system significantly impacts vehicle safety during emergency maneuvers or poor weather conditions.

Last service was at 152961km and I can confirm it was exactly the same problem as described. The diagnostic scan showed multiple error codes related to the lateral sensor and ABS module communication. The issue was actually the wiring harness between the lateral sensor and the control unit that had deteriorated over time. The repair cost was 450 Euro including labor and resolved all vehicle stability warnings. The electronic stability system is now functioning perfectly. The safety warning lights cleared immediately after the repair and haven't returned in 5000km of driving. I suggest getting a complete diagnostic scan from a qualified workshop to confirm if your issue matches this pattern. Vehicle stability is crucial for safety, so temporary fixes arent recommended.

Thanks for sharing your experience. On my A4, I also initially thought it was just the lateral sensor, but after dealing with similar symptoms, I learned these systems are quite interconnected. The yaw rate sensor readings on my car were also erratic, which is why they first suspected sensor issues. But the wiring diagnosis you had done makes perfect sense. The electronic stability system relies heavily on clean signals between components. When my ABS issues started, I first tried clearing the codes, but they kept returning because the root cause was still present. A proper diagnostic scan showed communication errors between modules, similar to your case. Your repair cost of 450 Euro for the wiring harness fix is actually quite reasonable. My initial quote for replacing the entire control unit was much higher before they identified the actual issue. This kind of wiring deterioration is apparently a known issue in these models as they age. Regular checks of the steering angle sensor connections and other electronic control components during maintenance can help catch these problems early.

Thanks for the extensive information shared. After confirming the diagnostic results at my workshop today, my issue turned out to be a wiring harness problem affecting both the lateral sensor and yaw rate sensor signals. The traction control warnings were triggered by poor communication between these components and the main control unit. The electronic stability system warnings appeared because the steering angle sensor data wasnt being properly transmitted due to the damaged wiring. The total repair came to 480 Euro with labor, which seems in line with others experiences. My vehicle now registers clean codes across all stability control systems. The ABS is fully functional and all warning lights have remained off after 200km of testing. I feel much more confident knowing the safety systems are working properly again. For others facing similar symptoms, getting a proper diagnostic scan is crucial since these issues can stem from various interconnected components in the stability control system.