I Also Have Origional Continental Tires.my Light Came On And My Pressure Was Down 7 Or 8 Pounds "psi".my Tire Light Came On Also At This Point.reinflated To .pressure Specs On Tire Yes 51psi And Light Went Out.these Must Be Like Aircraft Squat Switches.in Other Words When Pressure Is Put On The Switches Caused By Low Tires The Light Is On.when Inflated Correctly Body Raises Up And Takes Pressure Off And Breaks The Switch Connection.my D.o.t. Date For My Tires Is 0804 8th Week Of 2004.you May Also Have A Bad Sensor Causing Your Problem.good Luck