RS3 Power Loss Linked to Faulty Air Temp Sensor

Had the same IAT sensor problem on my 2016 S3 last winter. The symptoms match exactly what you describe, rough running engine, power loss and check engine light. The IAT sensor was reading incorrect temperature values, causing the engine management system to supply wrong fuel mixtures. The car sensor failure shows clear signs, if you scan with a diagnostic tool, you should see implausible air temperature readings. For a quick check, compare the readings at cold start versus warm engine. A faulty sensor will show erratic jumps or stuck values. This is not a major repair, but needs proper diagnosis since similar symptoms can come from other failed components like the MAP sensor or wiring issues. The IAT sensor replacement itself is straightforward, the tricky part is accessing it since its tucked into the intake manifold. When getting it fixed, make sure they: Test the wiring harness for damage, Clean the sensor housing and connector, Use OEM parts for the replacement, Clear all stored error codes after repair, Verify proper readings with engine cold and hot The engine issues will only get worse if left unaddressed since the system relies on accurate temperature data for optimal performance. Would recommend getting it checked soon before it leads to poor fuel economy or potential engine damage.

Thanks for the detailed explanation about the IAT sensor issue. I took my RS3 to the dealership last week with similar symptoms and they confirmed the faulty temperature sensor. The diagnostic tool showed unusual temperature reading fluctuations just like you described. The rough running and power loss issues are completely resolved now. Could you share how much you paid for the repair? Also wondering if youve had any other temperature sensor related problems since getting it fixed?

Thanks for the update on your RS3. Good to hear they found and fixed the faulty intake air temperature sensor. In my case, the total repair cost came to 155 Euro, which included the new sensor, labor, and diagnostic fees. The car has been running perfectly since the repair, no more erratic temperature readings or engine performance issues. The air temperature sensor now shows consistent values and the engine management system is getting accurate intake air data. Its been over a year now with no temperature sensor related problems whatsoever. Having a properly functioning car sensor makes a huge difference in engine performance and fuel efficiency. The stable temperature readings mean the engine can optimize the fuel mixture correctly. Just keep an eye on your diagnostic readings during regular maintenance to catch any future sensor issues early.

After getting multiple quotes, I finally took my RS3 to a dealership who properly diagnosed and fixed the IAT sensor problem. The whole repair including parts and labor cost me 320 Euro. More expensive than expected but worth it since the car runs perfectly now. The diagnostic tool readings all check out normal and the engine performance is back to what it should be. No more rough running or power loss issues. The intake air temperature readings are stable and consistent now, exactly like they explained would happen with a properly working sensor. Really glad I asked here first, helped me understand what I was dealing with before going to the shop. Good to know these temperature sensor problems are common and fixable. Will definitely keep monitoring the readings during future services to catch any issues early.