TT ABS Lateral Sensor Failure Causes Control Issues

As someone with moderate experience maintaining sports cars, I dealt with a very similar issue on my 2006 Audi A3. The symptoms were identical, persistent ABS warning light and disabled traction control. A diagnostic scan revealed problems with the yaw rate sensor and electronic stability system. After investigating multiple potential fixes, it turned out the control unit itself was defective and needed replacement. The electronic control module was corroded due to moisture exposure. The repair process involved: 1. Complete diagnostic scan 2. Wheel alignment check 3. Control unit replacement 4. System recalibration Total cost was 1000 Euro including parts and labor. The workshop needed about 6 hours to complete everything. Since the repair, all systems have worked flawlessly. Could you share: Have you noticed any unusual behavior during braking? Are there any other warning lights active? Has the car been exposed to water damage or flooding? When was the last wheel alignment performed? This information would help determine if your issue matches what I experienced and whether you might need similar repairs.

Last service was at 129263 KM and the safety warning lights started appearing shortly after. Thanks for sharing your experience. In my case, there is no unusual behavior during braking, and the traction control light is the only other warning active. No water damage history, and alignment was done during the last service. The electronic control symptoms you described match my situation exactly. Will schedule a full diagnostic scan to confirm if my control unit needs replacement. The 6-hour repair time helps with planning. Was your yaw rate sensor calibration included in that 1000 Euro cost?

Thanks for the additional details. Yes, the yaw rate sensor calibration was included in that total cost. Based on your mileage and timing of the safety warning lights, your situation sounds very similar to what I experienced. With no unusual braking behavior and only the traction control light active, the vehicle stability system is likely in a safe fail state. The diagnostic scan should confirm if the control unit is the culprit, rather than just the lateral acceleration sensor we initially suspected. A few tips from my repair experience: 1. The control unit replacement requires specific coding to your vehicle 2. Vehicle stability systems need proper calibration after any component replacement 3. A test drive with diagnostic equipment connected helps verify the fix The good news is your car being properly aligned and having no water exposure means the issue is likely isolated to the control unit itself. My repair has held up well for 40000km now with no reoccurrence of ABS or traction control warnings. Consider requesting the workshop to check the wiring harness connections while they have the system opened up. This preventive step adds minimal cost but can prevent future moisture-related issues.

Thanks for sharing such detailed insights about the yaw rate sensor calibration. The diagnostic scan is scheduled for next week and I will definitely have them inspect the wiring harness while they are at it. Good to know your repair has proven reliable over 40000km. The quoted repair cost matches what my shop estimated, around 1000 Euro including the calibration. They also mentioned the 6-hour timeframe, so that lines up perfectly with your experience. The similar symptoms and lack of other warning lights makes me confident we are dealing with the same control unit issue. Since my vehicle stability system is likely in fail-safe mode as you suggested, I will minimize driving until the repair. The traction control being affected definitely warrants caution. Will update once the lateral sensor and control unit diagnosis is complete. Thanks again for the thorough explanation of the repair process.