What safety precautions should I follow when using the Innova 5210 on a running vehicle?

Always operate the vehicle in a well-ventilated area to avoid carbon monoxide poisoning, and wear approved safety eye protection at all times. Keep a safe distance from moving engine parts such as the coolant fan, pulleys, and fan belt, and avoid contact with hot engine parts. Before starting an engine for testing, ensure the parking brake is engaged and the transmission is in park or neutral with drive wheels blocked. (Page 1)