I have twice now had my car opened by what is probably a "relay attack". Both times i returned to the car (2017 Model S) to find the courtesy lights on and the door handles presented. As it was night time in both cases in an unlit car park area i could it from probably 60 Metres away. Tesla seems to think it is ok as other manufactures cars suffer from the same attacks. I don't know if other owners received this email from Tesla, so if you did not here is a copy:- We would like to share some tips for ensuring the safety of your Tesla. When enabled, our Passive Entry setting will automatically unlock the doors of your Model S when you approach it with your key. Relay attacks, a type of vehicle break-in that can be targeted at vehicles from many manufacturers including Tesla, allows an attacker to transmit a signal from your key in one location to your car in another location, thereby creating the potential for unauthorised access and entry. You can decrease the likelihood of unauthorised entry by disabling Passive Entry when parked in public spaces or storing your key in a holder which blocks electromagnetic transmissions, such as a RFID-blocking sleeve or Faraday cage. To disable Passive Entry, touch Controls > Settings > Doors & Locks > Passive Entry > OFF. Please note that you must press the brake pedal to power Model S on before you can change this setting.