It will run until the car stops for more than a few seconds. At least, that= 's what happened to a friend's wife in her Mecedes SUV. The couple left tog= ether, she was driving, he had the keyfob in his pocket. She dropped him of= f somewhere and drove many miles without the key. When she eventually stopp= ed at a traffic signal the car shut off and she was stranded. Yes, there we= re probably lights on the dashboard attempting to warn her of her misdeeds. Bob ________________________________________ From: piclist-bounces@mit.edu on behalf of AB Pea= rce - UKRI STFC=20 Sent: Monday, July 9, 2018 8:43 AM To: Microcontroller discussion list - Public. Subject: RE: [EE]:: Wrapping key-FOBs in tinfoil > The really fun trick here is they make no effort to capture or crack any = codes, just boost a signal. And then keep repeating it so the car thinks the key is in it so once start= ed the engine keeps running. Although having said that, I know of an instance with a Volkswagen where an= owner opened the car and started it, went back in the house, left keys on = the table and (absent minded) went and got in the car and drove a couple of= hundred miles. Didn't realise he had left the keys behind until he had sto= pped the car, couldn't lock it, or restart it. I haven't )yet) tried with my Ford to see how long the engine will stay run= ning without the key in the car. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .