BMW engine light on but the car drives normal? In this video, I break down Valvetronic fault codes 135A08 and 136608, what they actually mean, and why they don’t always indicate a failed motor. BMW documentation points to a possible software-related issue, which means the fix may be as simple as clearing the faults or performing a Valvetronic relearn. This video explains when to diagnose further and when not to replace parts unnecessarily. 🔧 Topics covered: • BMW Valvetronic system basics • Fau