Mercedes-Benz 400E Rough Idle

Learn if it's a simple fix or time to seek out a trusted technician.

What are common reasons my Mercedes-Benz 400E has a rough idle?

While there are a variety of reasons your Mercedes-Benz 400E has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
of the time it's
Vacuum Leak
of the time it's
Spark Plugs
of the time it's
Ignition Coil

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Related Mercedes-Benz 400E Problems

Find the most common driver-reported problems that are to blame when a Mercedes-Benz 400E has a rough idle.
A faulty mass air flow (maf) sensor can cause erratic/rough engine operation and fuel economy issues. since this sens...

Mercedes-Benz 400E Rough Idle Repair Symptoms

A failing ignition coil can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I...Read More
When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing. The driver would likely notice one or more of t...Read More