RS4 TPMS Sensor Issues: Warning Light Won't Go Away

As someone with moderate car repair experience, I had a very similar issue with my 2003 RS6. The tire pressure warning kept appearing even though regular tire checks with a pressure gauge showed correct inflation levels. After several frustrating weeks of getting false low tire warnings, I took it to a workshop. The diagnostic revealed the tire pressure monitoring system sensors had dead batteries. These sensors are mounted inside each wheel and communicate wirelessly with the car computer. The total repair cost was 280 Euro, which covered replacing all sensor batteries. Since then, no more false warnings and the speedometer works perfectly. The job took about 2 hours since they needed to dismount all tires to access the sensors. To better assist with your specific case, could you share: Have you checked the actual tire pressure with a manual gauge? Which specific error message appears on the speedometer? Did you recently have any tire work done? Are the warnings constant or intermittent? The symptoms sound identical to my experience, but these details would help confirm if its truly the same sensor battery issue.

Last service done at 158875 KM. Just had a professional tire check following the warnings. All pressures were perfect according to manual gauge readings. The TPMS sensor fault continues to show up every few minutes of driving. The mechanic confirmed air valve seals are good and no slow leaks detected. Will try resetting the system before considering sensor replacement. For reference, my tire inflation readings were: Front: 2.5 bar Rear: 2.3 bar Given the age of the car, replacing the complete sensor set might be the most reliable fix. Would hate spending money on battery replacement only to face other sensor-related issues soon after.

Thanks for those details. Having gone through this exact situation with my RS6, I can confirm those pressure readings are spot on, yet the TPMS issue persists just like in my case. After my sensor battery replacement, I actually ended up with repeated TPMS issues within 6 months. In hindsight, I should have opted for complete sensor replacement rather than just the batteries. The symptoms youre describing, intermittent warnings despite correct pressure readings, match my experience perfectly. The constant reset attempts might work temporarily, but based on my repair journey, its likely just masking a deeper sensor fault. Complete sensor replacement ended up costing 520 Euro, but it solved all TPMS issues permanently. The repair included: New sensor units for all 4 wheels, System recalibration, Fresh valve stems Given your vehicle age and mileage, Id recommend going straight for full sensor replacement rather than the battery-only fix I initially tried. It will save money in the long run and provide more reliable tire pressure monitoring. Should you need tire pressure reference points in the future, those readings you shared (2.5 front, 2.3 rear) are exactly what the manual specifies for our model.

Thanks for sharing those repair experiences. Think youre right about going for full sensor replacement rather than just batteries. The constant TPMS warnings despite correct tire pressure readings are really annoying, and a complete fix makes more sense than partial repairs at this point. Appreciate the confirmation about my pressure readings being correct. Will skip the system reset attempts and book the car in for new sensors next week. The 520 Euro cost seems reasonable for a permanent solution, especially considering the hassle of dealing with recurring TPMS issues. Making a note of those pressure specs for future tire checks: Front: 2.5 bar Rear: 2.3 bar Better to fix it properly now than deal with failing sensors again in a few months. Will update once the repair is done. Tired of those false low tire warnings popping up during every drive.