Audi A7 Sensor Issues Causing Power Loss and Noise

I had a very similar issue with my Audi A6 (2017, gasoline) last month. Having some experience with sensor-related problems, I recognized the symptoms you described. The air intake system was showing similar signs, whistling noise, reduced power, and the temperature sensor throwing error codes. The temperature fluctuation was quite noticeable on the scan tool readings. Initially, I thought it was just the air sensor itself, but the workshop found the root cause was actually a damaged wiring connection to the temperature gauge system. The diagnostic process was pretty thorough. They: 1. Performed a complete scan 2. Tested the air intake system 3. Checked all sensor connections 4. Verified the temperature sensor readings 5. Inspected the wiring harness The fix involved repairing the cable connection to the temperature sensor, which cost 95 Euro including labor. No other components needed replacement in my case. To provide more specific advice for your situation, could you share: Any recent modifications to the air intake system? When did the symptoms first appear? Are the symptoms constant or do they vary with engine temperature? What exact error codes is your system showing?

Thanks for sharing your experience. My last service was at 14279KM and the issue started shortly after. The airflow sensor readings on my scan tool show similar temperature fluctuation patterns to what you described. The whistling noise is definitely most noticeable during hard acceleration. The air temperature readings jump erratically when the engine is under load. Running a detailed scan showed P0113 and P0098 codes, both related to the air intake system. I have not made any modifications to the engine or intake components. The symptoms seem more pronounced when the engine is cold. The 95 Euro repair cost you mentioned sounds reasonable if it turns out to be just a wiring issue. Will have the workshop check the temperature gauge connections first before replacing any sensors.

Based on those error codes and symptoms, especially the erratic air temperature readings under load, this definitely sounds like the same wiring issue I encountered. The temperature fluctuation pattern is a telltale sign of a connection problem rather than a faulty automotive sensor itself. The cold engine behavior you mentioned adds weight to this theory. In my case, the temperature sensor readings were most unstable during cold starts when the air intake system was adjusting to temperature changes. Getting those specific error codes (P0113/P0098) is actually good news. When my engine sensor system showed these same codes, it confirmed the issue was isolated to the air temperature monitoring circuit. The repair ended up being straightforward once they found the damaged wire. A thorough check of the sensor connections should be the first step. The air intake system is exposed to significant temperature and vibration stress, which can loosen connections over time. In your case, with relatively low mileage, its likely just a connection issue rather than sensor failure. Would suggest having them: 1. Test the sensor resistance values 2. Check connector pins for corrosion 3. Verify wiring continuity 4. Monitor live data during cold starts

Thanks everyone for the detailed responses. After getting such specific input about the error codes and testing process, I feel much more confident about the repair direction. The correlation between my symptoms and the described wiring issues makes a lot of sense, especially how the temperature gauge readings act up during cold starts. The fact that the engine sensor system showed identical codes (P0113/P0098) is reassuring. I have scheduled a workshop visit for next week. Will have them focus first on checking the charge sensor wiring and connections before replacing any parts. The automotive sensor testing sequence suggested sounds thorough, particularly monitoring the air intake system during cold starts. Will definitely check the temperature readings after repair to ensure the fix resolved both the performance issues and error codes. If it ends up being just a wiring repair like mentioned, the 95 Euro cost would be much better than replacing sensors unnecessarily.