Yybc, that depends if there’s an electronic ignition which turning the knob activates.
Barry, really now, if you told that fellow that pikuach nefesh docheh Shabbos, he’d say, “Wow, I never knew that! I really should have taken my grandfather to the hospital when he had a heart attack on Shabbos instead of letting him die! Thanks for the info! Now I’ll know for next time!”??
It was lack of seichel, not lack of halachic knowledge.