Strange noise Lexus IS300H

[IS88CGB]

Hello! I have a 2013 lexus IS300H.

starting this morning, a strange noise can be heard from the engine. It is heard when the car is started and continues for approx. 30 seconds after stopping. It doesn't give me any error on the diagnosis.

 It was -4 degrees where I parked the car. Moreover, I drove around 40 km after I heard that noise this morning, it had warmed up but the noise was present, still continuous. I used Hybrid assistant and after all those kilometers the temperature in the inverter while running shows 17 degrees and when I stopped at the traffic light it said Low. Maybe I didn't notice that noise until now, maybe...although I don't think so. The liquid level in the inverter is between minimum and maximum. I don't think it went down. 

[Notamech]

This has come up before. Most likely the throttle body. Its normal when the car is on. To confirm if you disconnect the throttle body connector the noise will stop. Make sure you connect it back though.