Hi Steve, when I get into the car, all is quiet, put in the key, and do not turn it the noise begins. I do not know how long, but it goes on for quite some time. Even if you remove the key it continues for 2-3 minutes. I keep the car inside my workshop, and I am going up there today so I can get a better idea of how long it lasts once the key is in. I did post the issue with the Jaguar voice command not responding, could they be related ? Thanks for coming back to me, I have had the car just under three months now, and still finding my way around it. Kind regards Trevor.