A flickering CEL and rough idle on a Mercedes W213 usually points to a misfire. Here’s what to check first and when it’s safe to keep driving.
If your Mercedes-Benz E-Class W213 starts idling unevenly and the check engine light flickers from time to time, it's normal to feel a little uneasy. In most cases this isn't a catastrophic failure — it's usually a misfire, and on these cars a misfire tends to come from one of a handful of common, fixable parts. The flicker itself is important: it means the engine control unit (ECU) has detected a misfire serious enough that unburned fuel could be getting into the exhaust system.
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