RS6 Fuel Sensor Triggers Stalling and Warning Light

Had almost the same issue with a 2005 RS4. As someone with some hands-on experience working on these models, the symptoms you describe sound very familiar. In my case, the check engine light and stalling turned out to be caused by a blown fuse connected to the fuel sensor system. The faulty sensor reading was triggering incorrect fuel mixture calculations, leading to the stalling. Had it checked at a workshop and they identified the issue quickly. Total repair cost was 52 Euro for diagnostic and fuse replacement. However, sensor faults can be tricky and your issue might be different. To provide more specific guidance, could you share: Have you noticed any unusual fuel gauge behavior? Does the stalling happen more frequently when the tank is below half full? What specific error codes is the scan showing? Any recent fuel system work or maintenance? These details would help determine if your car sensor issue matches what I experienced or if its something more complex in the fuel tank system.

Thanks for sharing your experience. My last service was 2 weeks ago at 179257 KM. After checking all fuses and getting another scan, Im certain the car electronics are showing a specific fault with the fuel tank level sensor. The stalling definitely gets worse when fuel drops below quarter tank, and the fuel gauge jumps erratically between readings. The error code consistently points to a faulty sensor in the fuel delivery system. Its frustrating since the car runs perfectly fine when the tank is full. Based on your feedback about the fuse, I checked all related fuses but they seem intact. Looks like I might need to bite the bullet and replace the actual sensor.

Thanks for those additional details, they actually mirror what happened with my RS4 after the initial fuse fix. While changing the fuse solved it temporarily, the erratic fuel gauge behavior eventually returned, pointing to a deeper fuel sensor issue. When my fuel tank dropped below quarter full, the stalling became more frequent, exactly like youre experiencing. The faulty sensor was sending incorrect readings to the fuel system, causing the engine management to miscalculate fuel delivery. The fix required replacing the complete fuel level sensor unit. The repair cost was around 380 Euro including parts and labor. While not cheap, it resolved both the stalling and gauge issues completely. The car sensor replacement also cleared the persistent check engine light. One tip: If you decide to replace the fuel sensor, make sure to check the entire fuel delivery system while its being serviced. In my case, they found some sediment in the tank that might have contributed to the sensor failure. A thorough fuel system cleaning can prevent future sensor problems. Since youre seeing identical symptoms to what I experienced, especially the correlation between fuel level and stalling, a sensor replacement is likely your best solution.

Thanks everyone for the helpful input. After weighing the evidence and checking the symptoms against your experiences, I went ahead with replacing the fuel level sensor. Total cost came to 395 Euro with parts and labor, slightly more than expected but worth it. The repair has completely resolved both the stalling and the check engine warning. The car electronics are now working perfectly and the fuel gauge shows steady, accurate readings. They also found and cleaned some debris in the fuel tank during the repair, which might have been causing the faulty sensor readings in the first place. For anyone searching the forums later with similar issues, if you see erratic fuel gauge readings combined with stalling at low fuel levels, definitely get your fuel tank level sensor checked. The correlation between fuel level and engine performance turned out to be the key indicator in diagnosing this problem. Really appreciate all the guidance that helped me pinpoint the issue and avoid unnecessary repairs.