RS5 Power Loss & Rough Idle Linked to IAT Sensor

Had a similar situation with my 2016 S5. The intake air temperature sensor failure showed identical symptoms, engine power loss and rough running. The check engine light triggered due to incorrect air-fuel mixture since the air sensor was sending faulty readings to the ECU. The IAT sensor diagnosis required specialized testing equipment to confirm the malfunction. Initial symptoms can mirror other issues like MAF sensor problems, but the specific error code pointed to the air temperature sensor. The repair involved replacing the complete air sensor unit since individual components are not serviceable. While not a major repair in terms of complexity, the issue can cause significant engine performance problems if left unaddressed. The engine relies heavily on accurate air temperature readings to maintain proper fuel mixture. In my case, the repair took about 2 hours of labor time. Before visiting a shop, you can try unplugging the air sensor connector and cleaning it with electronic contact cleaner, sometimes carbon deposits or corrosion cause false readings. However, given the age and mileage of your RS5, a full sensor replacement might be necessary. The car sensor replacement restored normal power delivery and eliminated the rough running condition completely. Definitely worth addressing promptly to prevent potential long-term engine issues.

Thanks for sharing your experience. Good to hear replacing the sensor fixed those symptoms. My car is now running much better after the repair. The car diagnostics showed it was indeed the intake air temperature sensor causing the problems. Did you remember roughly what the total cost was for parts and labor? Also wondering if youve had any other air sensor issues since getting it fixed?

Glad the IAT sensor replacement resolved your issues. The total cost for my repair came to 155 Euro, which covered both the new sensor and labor. The temperature reading has been spot-on since the fix, and I havent experienced any other engine issues or air sensor problems in the past few years. The mechanics diagnostic was exactly right in identifying the faulty intake air temperature sensor. These sensors are generally quite reliable once replaced, so you likely wont face similar problems again. Regular maintenance checks of the air intake system can help prevent future sensor failures. A properly functioning IAT sensor makes a huge difference in engine performance. You should notice consistently smooth operation now that the car is getting accurate air temperature measurements for optimal fuel mixture.

Just picked up my car from the shop after dealing with the intake air temperature sensor replacement. The whole process went smoother than expected. The mechanic confirmed the car diagnostics I had researched were accurate, and the repair took about 2 hours. The total bill came to 180 Euro, which included parts and labor. Not as expensive as I feared after my last repair experience. The engine issues cleared up immediately, no more check engine light, power is back to normal, and the rough running is completely gone. Really appreciate the insights shared here. Helped me go into the shop better informed and confident about the likely problem. The car sensor replacement was exactly what it needed. Will definitely keep a closer eye on air temperature readings through my OBD scanner going forward to catch any early warning signs.