That dreaded check engine light suddenly illuminating your dashboard can turn any peaceful drive into a moment of anxiety. For luxury car owners, this warning signal often indicates complex electrical systems requiring specialized diagnostic attention. Modern luxury electric cars pack sophisticated computer systems and intricate electronic networks that make traditional diagnostic methods insufficient. Understanding these advanced systems and their potential issues requires specialized knowledge and professional-grade tools. This comprehensive guide walks you through the essential steps of diagnosing check engine light warnings in luxury vehicles. We'll explore the professional diagnostic tools, common error codes, and advanced testing procedures needed to identify and resolve electrical issues effectively.