IlyaKol wrote:Car will allow you to lock keys with the car on as long as the key isn't in the car (locked from the door handle I mean). That's how I warm my car up at work back when I worked in an office. If you leave the key in the cup holder and try to lock the car from the outside via the door handle, then it won't lock.
Also, to add, I did a test with my brother who drive my car down the street with the key in my pocket sitting on the porch because I had started it and walked away. He would not have been able to start it once he shut it off...so a thief will only get so far

. This did happen at the local full-service car wash, but I was 15ft away so no biggie.