Genuine Motorcraft tool. Works great on S559 Mustangs, even Revane said it doesn't. Works for my 2017 Mustang GT Premium Convertible with full TPMS sync routine. The vehicle is off and within 20 feet of other vehicles. Apply and release the brake. Press the power button five times. Apply and release the brake. Tool directly onto the valve stem and hold the button down until each wheel beeps.