Q2 ABS Light On, Failed Sensor Causing System Issues

When my 2017 Audi Q3 2.0 TFSI had similar symptoms, it turned out the issue was more complex than a lateral sensor. The diagnostic revealed a defective control unit affecting both the ABS and electronic stability systems. The vehicle stability warning light stayed on constantly, and the traction control stopped working entirely. The yaw rate sensor readings were inconsistent, which initially misled the first diagnosis. The ABS controller needed complete replacement as internal components had failed, not just a simple sensor swap. This was a serious safety issue requiring immediate attention since it disabled multiple critical driving assistance features. The repair involved programming and coding the new control unit to sync with the vehicle systems. This issue is relatively rare but tends to surface in vehicles approaching similar mileage. When it happens, its best to address it immediately since driving without ABS and stability control significantly reduces vehicle safety. The repair requires specialized diagnostic equipment and manufacturer-specific programming tools. Based on those symptoms described, its worth getting a second opinion from a workshop specializing in Audi electronics, as basic diagnostic tools might not detect the full scope of the problem.

Thanks for sharing your Q3 experience. That really helps since these control unit issues can be quite tricky to diagnose correctly. My ABS problems definitely sound similar to what you encountered, especially with the stability control acting up. Would you remember roughly how much you ended up paying for the complete fix? Also curious if youve had any other electronic stability or traction control related problems since the repair was done? My wheel alignment was actually done last month, so I can probably rule that out as a potential cause. Really hoping its not going to be as complex as your case, but its good to know what to expect.

Thanks for following up. After taking my Q3 to a certified workshop, the lateral sensor fault was indeed fixed. The total bill came to 1000 Euro for replacing the affected control unit which was completely defective. The diagnostic scan confirmed it was similar to your situation, where both the ABS and electronic stability systems were compromised. Since the repair, everything has worked flawlessly for over 18 months now. No more vehicle stability warnings or traction control issues. The workshop explained that when these control units fail, they typically need complete replacement rather than repair. While the cost was significant, having proper ABS and stability control functioning is essential for safety. The repair process included comprehensive testing to ensure all safety systems were properly calibrated and communicating correctly. If your symptoms match what I experienced, you might be looking at a similar repair scope and cost. The important thing is getting an accurate diagnosis from a shop with the right diagnostic equipment to properly assess these electronic systems.

After getting multiple opinions, I finally took my Q2 to a specialized Audi workshop. Turns out the issue was exactly like yours, a faulty control unit affecting multiple systems. The mechanic found that the yaw rate sensor was sending incorrect signals, which explained why the vehicle stability system was acting up. The total repair came to 950 Euro, pretty close to what you paid. They replaced the entire control unit and recalibrated all safety systems. The traction control and ABS are now working perfectly. The whole job took about 4 hours, and they did a thorough test drive to confirm everything was communicating properly. Really glad I asked here first, saved me from getting the runaround with cheaper fixes that wouldnt have solved the underlying problem. Going to stick with this new workshop from now on since they clearly know what theyre doing with these complex electronic systems.