Audi A4 Air Sensor Issues Draining Engine Power

Had almost the exact same issue with my 2020 Audi A3 last winter. As someone with moderate experience working on cars, I initially tried basic diagnostics but quickly realized this needed professional attention. The car temperature reading was unstable and the engine would run rough, especially during cold starts. The car diagnostics confirmed the intake air temperature sensor was malfunctioning. Had it checked at a workshop where they performed a complete temperature sensor test to verify the issue. The repair was straightforward, they replaced the faulty car sensor and recalibrated the system. Total cost came to 155 Euro including parts and labor. Since the fix, the engine issues have completely disappeared and performance returned to normal. Before suggesting specific solutions for your A4, could you share: Current mileage, When exactly did symptoms start, Any recent maintenance or repairs, Any other warning lights or messages, Are symptoms constant or intermittent This information would help determine if your case matches what I experienced with my A3.

Thanks for sharing your experience. My A4 has 145057KM on the odometer, with the last service completed just 2 months ago. The symptoms you described with your car sensor match mine exactly, especially the unstable temperature readings and rough running. This gives me more confidence that the intake air sensor is likely the problem. Based on your repair cost of 155 Euro, this seems like a reasonable fix to pursue. The car diagnostics are pointing to the air temperature sensor as well, so hearing about your successful repair is encouraging. Will schedule an appointment to have this checked out.

Thanks for the additional details about your A4. Your mileage and symptoms align perfectly with what I experienced, my IAT sensor failed around 140000KM. The diagnostic readings on my A3 also pointed to similar issues with unstable intake air temperature measurements. Since your car diagnostics are already indicating air temperature sensor problems, and given the identical symptoms to what I faced, I would definitely recommend getting it replaced soon. Running with a faulty IAT sensor can lead to poor fuel economy and potential engine issues if left unchecked. Just make sure the workshop does a complete diagnostic test to verify the sensor is the only issue. In my case, they first confirmed the malfunction using a specialized diagnostic tool before proceeding with the replacement. The 155 Euro I quoted earlier included labor, but prices may have adjusted slightly since my repair. The job itself took about an hour, and the improvement in engine performance was immediate after the fix. Would be interested to hear how your repair goes and if the cost ends up being similar to what I paid.

Thanks for the input. The symptoms and diagnostic information shared here have been really helpful in confirming my suspicions about the IAT sensor being the root cause. With my A4 showing identical issues at a similar mileage point, and the car diagnostic tool pointing to the air temperature sensor, I feel confident moving forward with the repair. The estimated 155 Euro cost seems reasonable considering the potential engine issues that could develop if left unfixed. I will book the appointment and make sure they do a complete diagnostic test first to verify the temperature reading problems are solely due to the faulty car sensor. Will definitely follow up here after the repair to share the actual cost and results for others who might face similar engine issues in the future.