Mercedes-Benz S63 AMG daytime running lights not turning on, possible engine issue on Mercedes-Benz S63 AMG

Some Mercedes-Benz S63 AMG owners report experiencing issues with their daytime running lights not turning on, which may not be directly related to engine problems. Common causes include burnt-out bulbs or blown fuses, which should be checked first. If both lights are non-functional and the fuses are intact, owners may face electrical circuit issues, such as faulty sockets or wiring problems. A systematic diagnostic process is essential to identify the root cause, involving inspections of the wiring harness and electrical connections. Regular maintenance of the lighting system is crucial to prevent such issues, ensuring bulbs are in good condition and connections are secure. Additionally, while the daytime running lights issue may not be engine-related, some owners note that components in the engine bay, like the crankcase breather valve, can fail and impact nearby electrical components due to heat.