VW Eos TDI Boost Hiss & Power Loss Symptoms Fixed

I had nearly identical symptoms with my 2013 VW Passat TDI last summer. With some experience working on VW diesels, this sounded very familiar. The whistling noise combined with reduced power often points to issues with the air intake system. In my case, the temperature sensor was giving false readings due to a damaged wiring connection, which caused the engine to run in reduced power mode. My mechanic performed a thorough diagnostic of the airflow sensor system and discovered that the charge air temperature sensor connector had corroded terminals. The cable connection to the component was defective, causing erratic temperature fluctuation readings. The fix involved replacing the wiring harness and connector, which resolved both the whistling noise and power issues. Total repair cost was 95€. To better assist with your specific case, could you share: Has the whistling sound gradually increased over time? Are there any other warning lights besides the engine light? Have you noticed any changes in fuel consumption? Did you get the specific error code from the scan tool? The solution might be similar, but these details would help confirm if your Eos is experiencing the same underlying issue as my Passat.

Last service was at 98000km, and after investigating the error codes P0101 and P0113 more thoroughly, I discovered a cracked air intake hose near where the engine temperature sensor connects. This explains the whistling sound and reduced power. The air sensor readings were likely affected by the unmetered air entering through the crack. The vacuum leak is causing the airflow sensor to report incorrect measurements, leading to the engine running poorly. A proper diagnosis confirmed the temperature sensor is functioning correctly, but the compromised air intake is throwing off all sensor readings in that area. I am replacing the intake hose assembly tomorrow. This should resolve both the whistling noise and restore proper engine performance by allowing the airflow sensor system to take accurate measurements again.

Thanks for the update on your Eos, this actually matches exactly what I discovered later with my Passat. After my initial wiring repair, I also found a hairline crack in the intake hose that was causing similar issues. The P0101 and P0113 codes definitely align with an air intake leak affecting both the airflow sensor readings and temperature fluctuation data. These cracks often develop right near where the air temperature sensor connects, as that area experiences a lot of heat cycling and vibration. When I replaced my intake hose assembly, it completely resolved the whistling and restored full power. Just make sure to inspect all the clamps and connectors while you have everything apart, my mechanic found that the old clamps had become brittle and one actually cracked during removal. The engine sensor system is pretty sensitive to any unmetered air, so a proper seal around that intake hose is critical for accurate airflow and temperature readings. Once everything is sealed up properly, the engine management system should return to normal operation. Would be great if you could update us after the repair to confirm it solved the issues.

Thanks for following up on my repair progress. You're absolutely right, the location of that crack near the sensor connections seems to be a common failure point. After inspecting more closely, I noticed the rubber has deteriorated significantly around the clamp areas too. Your experience helped confirm my diagnosis. The P0101 and P0113 codes make perfect sense now, given how the vacuum leak was affecting both the airflow sensor and temperature readings. I appreciate the tip about checking all the clamps during the repair. I will definitely inspect and likely replace them while I have the intake system apart. I have ordered a complete intake hose assembly including new clamps. The automotive sensor system should work properly once everything is sealed correctly and the engine is getting accurately metered air through the intake. I am confident this will resolve both the whistling noise and power loss issues. I will post an update after completing the repair tomorrow to let everyone know if it fully solved the problem. The air temperature and airflow sensor readings should return to normal once the intake system is properly sealed again.

Intake air temperature sensor 1 bank 1 circuit range/performance What part is this and location. (AUDI A6 C7 2016 2.0TDI) Thanks.

Intake air temperature sensor 1 bank 1 circuit range/performance What part is this and location. (AUDI A6 C7 2016 2.0TDI) Thanks.

The intake air temperature sensor is responsible for measuring the temperature of the air entering the engine, which helps the engine control unit (ECU) adjust the air-fuel mixture for optimal performance. On your 2016 Audi A6 C7 2.0 TDI, this sensor is typically located in the air intake duct or near the throttle body. To locate it, follow the air intake hose from the air filter box towards the engine. The sensor is usually mounted on or near the intake manifold. If you're experiencing issues related to this sensor, such as a check engine light or performance problems, inspect the sensor and its wiring for any signs of damage or corrosion. If you need further assistance or have any questions, feel free to ask!

If you need further assistance or have any questions, feel free to ask!