RS6 Charge Sensor Failure Causing Power Loss & Hissing

Similar issues occurred on my RS4 2017. The charge sensor malfunction combined with temperature sensor errors pointed to a failing air intake system. The whistling sound typically indicates an air leak, which affects both the charge sensor readings and air temperature measurements. The repair process involved: Full diagnostic scan of automotive sensor systems, Inspection of charge sensor wiring connections, Air intake system pressure testing, Replacement of faulty temperature sensor mounting, Resealing of loose air intake connections The fix proved reliable, with no recurring issues after 40000km. This was a moderate repair job requiring specific diagnostic equipment. The most critical part was ensuring proper sealing of all air intake components, as even minor leaks can trigger multiple sensor errors. The symptoms you describe match almost exactly what happened with my car, particularly the power loss and whistling noise. These issues typically worsen if left unaddressed, potentially leading to more severe engine performance problems. A qualified workshop should be able to diagnose and repair this within a day, depending on parts availability. This requires proper testing equipment and expertise with turbo systems.

Thanks for the detailed explanation of your RS4 repair. Your symptoms really do match what I am experiencing with my RS6. The temperature gauge and charge sensor issues, combined with that distinctive whistling, seem to point toward the same air intake problem you mentioned. Did you remember roughly how much you paid for the complete repair? Also, have you experienced any other engine sensor issues since the initial fix?

After taking my RS4 to a certified shop, they quickly identified and resolved the issue. The main problem was actually just a damaged cable connection to the charge air temperature sensor. The total repair came to 95 Euro, which was a relief since I initially feared a more complex and costly fix. Since fixing the faulty connection, the automotive sensor system has been working flawlessly. No more error codes or temperature sensor warnings have appeared. The whistling noise completely disappeared, and the engine power returned to normal immediately after the repair. The technician explained that these air intake system issues often stem from simple connection problems rather than actual sensor failure. A proper diagnostic check helps avoid unnecessary parts replacement. In my case, they checked all related air sensor components but only needed to repair the one faulty connection. No other engine or sensor problems have occurred in the 15000km since the repair. The air temperature readings have remained stable, and the charge sensor functions perfectly. Looking back, I should have addressed it sooner, but at least it turned out to be a straightforward and relatively inexpensive fix.

Thanks for the input. I finally got my RS6 fixed last week and wanted to share my experience. The mechanic found that my charge sensor wiring was indeed damaged, with a loose connection affecting the air intake system. The repair took about 3 hours total. They performed a complete diagnostic scan, found the damaged wiring near the air temperature sensor, and replaced a worn gasket that was causing the whistling noise. Total cost was 180 Euro including parts and labor. After a week of driving, the engine performance is back to normal. No more temperature fluctuations or error codes. The whistling noise is completely gone, and power delivery feels smooth again. The engine sensor system is working perfectly now. Definitely glad I got this fixed quickly before it could cause more serious issues. Really appreciate all the advice here which helped me understand the problem better before visiting the shop.