Went to my garage. Car has been off for 8 hours. When I walked in I heard an electric motor/fan kick on. Up under the rear of the car. Finally I started then turned off the car and it went off. Is it a motion activated electric fuel pump priming the system? My A8 had a similar system but it only stayed on a few seconds. This was on at least 60-90 seconds until I started the car.

 

https://www.clublexus.com/forums/is-...noise-yay.html

Lou

 

Well, there you go. Thanks.