What are the reasons why a Mercedes-Benz won't start?
2 Answers
Mercedes-Benz won't start for the following reasons: Dead battery: The trunk is not completely closed, and the trunk light stays on, causing the battery to drain. Spark plugs cannot ignite: Spark plugs themselves are easily damaged, and short circuits in high-voltage lines can cause the spark plugs to fail to ignite. Another reason is that poor-quality spark plugs can also prevent normal starting. Starting circuit failure: When starting, there is only a slight "click" sound and no further response, which is caused by a stuck starter relay. At this time, simply pressing the tail of the electromagnet to force it to move forward can connect the starting circuit, thereby starting the engine.
When I first drove a Mercedes, I also encountered starting issues. Common causes include an aging or depleted battery, especially in models with start-stop systems, where battery life tends to be shorter. You can first check if the dashboard lights are dim or if the horn sounds weak. If there's no response at all, it's likely the battery is dead. Another possibility is a faulty starter motor—turning the key only produces a clicking sound without the engine engaging. A failed fuel pump can also cause this, where the engine starts but immediately stalls. By the way, Mercedes' anti-theft system is very sensitive; a dead remote key fob or signal interference can lock the engine, usually with a dashboard warning. In cold weather, high oil viscosity can also make starting difficult. If you're unsure, don't force it—calling roadside assistance is the safest option.
