A flickering check engine light and rough idle in a Mercedes-Benz S-Class W223 usually signals an active misfire. Here’s what to inspect first, and whether you can safely drive it.
If your W223’s check engine light flickers at idle and the engine feels like it’s running over a rough cobblestone, you’re probably dealing with a misfire. That blinking light is the engine control unit’s way of saying “fuel is being burned inefficiently right now,” and it’s different from a steady check engine light. On a modern S-Class, this usually points to an ignition or fuel delivery problem — but it’s often fixable without replacing major assemblies.
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