RS4 Power Loss Points to Faulty Air Temp Sensor

Had a similar issue on my Audi S5 (2016) last season with identical symptoms, reduced power, rough running, and check engine light. Car diagnostics confirmed a faulty intake air temperature sensor. The air sensor was failing to provide accurate temperature readings to the ECU, causing incorrect fuel mixture calculations. This seriously affects engine performance since the computer needs precise air temperature data to optimize fuel delivery. Repair involved removing the air intake assembly to access and replace the temperature sensor. The fix was straightforward but required specific diagnostic equipment to clear the error codes and verify proper sensor function. After replacement, all symptoms disappeared immediately, proper power restored and engine running smoothly. While this is not a major mechanical issue, running with a defective air sensor can lead to poor fuel economy and potential engine damage if left unchecked. The air temperature sensor is a critical component for proper engine management. Testing confirmed the new sensor was reading correctly through different temperature ranges. Most important is using a quality OEM part to avoid repeat failures.

Thanks for sharing your experience with the air temperature sensor issue. Glad to hear the fix worked well for you. My engine is running perfectly now after getting it sorted, and that rough running completely disappeared once the new sensor was installed. Quick question, do you recall roughly how much you paid for the repair? Also wondering if youve had any other temperature sensor related problems since the replacement? Might be helpful for others to know if its just a one-off fix or if we should watch out for similar issues down the road. The air sensor readings are crucial for engine performance, so its good to catch these problems early.

Just got back from checking my records about the repair costs. The total came to 155 Euro for replacing the malfunctioning intake air temperature sensor, which included both parts and labor. Worth every cent since the engine performance returned to normal right after the fix. Happy to report that since getting the faulty air sensor replaced, everything has been running perfectly for months now. No repeat temperature sensor issues or engine problems whatsoever. The car diagnostics have shown all readings in normal range during routine checks. You are absolutely right about catching these issues early. A failing air temperature sensor can really impact engine performance and fuel efficiency if left unaddressed. Based on my experience, once properly replaced with a quality part, these sensors tend to be quite reliable and shouldnt need frequent replacement. Its great to hear your car is also running smoothly after the repair. The immediate improvement in performance really shows how critical accurate air temperature readings are for proper engine function.

After checking multiple mechanics, I finally took my RS4 to a reputable shop that properly diagnosed the issue. The repair went smoothly and cost me 180 Euro total. The mechanic used their diagnostic tool to confirm the faulty air temperature sensor was causing all the problems. The whole process took about an hour. They replaced the sensor, cleared the error codes, and ran several tests to ensure all engine parameters were correct. The difference in performance was immediate, no more rough running or power loss issues. Its been 3 months since the repair, and the car runs perfectly. My mechanic mentioned these sensors typically last many years when replaced with quality parts. Regular monitoring of engine parameters through the cars diagnostic system shows all temperature readings are now spot on. Looking back, I probably should have addressed the issue sooner, but at least now I know what to watch for. The experience taught me that even small sensors can have a big impact on engine performance.