Audi S8 TPMS Warning Persists Despite Proper Pressure

Had exactly the same issue with my 2012 Audi S6 4.0 TFSI. As someone with some experience working on cars, I first tried the basic troubleshooting steps, checking tire pressure with a reliable pressure gauge and resetting the system, but the warning kept coming back. After these attempts failed, I took it to a workshop where they diagnosed a sensor fault in one of the tire pressure monitoring sensors. The problem was simply that the battery in one of the sensors had died. These sensors are sealed units, so when the battery dies, the entire sensor needs replacement. The fix involved: Diagnostic scan to identify the specific faulty sensor, Removing the tire from the wheel, Replacing the tire pressure sensor, Remounting and balancing the tire, Programming the new sensor to the car system Total cost was 280 Euro including parts and labor. Since then, the system has worked flawlessly with no false warnings. To help diagnose your specific case better: Which tire position shows the warning? Does the warning come on immediately after starting the car? How long ago was the last tire pressure sensor replacement? Have you had any recent tire work done?

Thanks for the detailed reply. My car has 178990 KM and I am still dealing with this TPMS issue. After reading your response, I checked the service history and noticed the original tire pressure sensors were never replaced. Just tried another reset of the system today but the low tire warning returned within 10 minutes of driving. The warning appears for the front right tire specifically, and yes, it shows up almost immediately after starting the car. I have double checked the air valve and tire inflation, everything seems normal when measured. No recent tire work has been done. Based on your experience, it sounds like I am dealing with the same sensor battery failure. Will schedule an appointment to have the TPMS sensor diagnosed and likely replaced.

This definitely sounds like the same sensor battery issue I dealt with. The symptoms match exactly, especially the warning coming back quickly after reset and always showing for the same tire position. With 178990 KM on the original sensors, you are definitely due for replacement. The front right sensor was also the one that failed on my S6. These tire pressure sensors typically last 5-8 years before the battery dies, and at your mileage its actually impressive they lasted this long. Quick tip from my experience: while the workshop has the tire off to replace the faulty sensor, consider having them check the other sensors battery levels. Since they were all installed at the same time, the others might not be far behind. Could save you from repeat visits if another sensor fails soon after. The air valve and tire inflation being normal on manual checks confirms this is a sensor fault rather than an actual pressure issue. The diagnostic scan should quickly pinpoint the problem, just like in my case. Make sure the workshop programs the new sensor properly to match your vehicle system, this is crucial for proper tire pressure monitoring function going forward.

Thanks for providing such specific information about the sensor battery failure. Just scheduled the appointment for next week. Looking at nearly 180000 KM on these original sensors, I should probably take your advice and have them check all tire pressure sensors while the car is in. Would rather handle everything in one visit than deal with multiple sensor failures over the next few months. This constant low tire warning has been quite annoying, especially since manual tire pressure checks kept showing normal readings. At least knowing others have successfully resolved the same issue makes me confident about the repair path forward. The flat tire warnings should hopefully stop once I get the faulty sensor replaced and properly programmed. Will update on what the workshop finds, but based on the matching symptoms, I am pretty sure you nailed the diagnosis. Just hope the repair cost stays around what you experienced for the sensor replacement and programming work.