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Mercedes-Benz C240 Rough Idle

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

What are common reasons my Mercedes-Benz C240 has a rough idle?

While there are a variety of reasons your Mercedes-Benz C240 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.
34%
of the time it's
Vacuum Leak
21%
of the time it's
Spark Plugs
15%
of the time it's
Ignition Coil

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Related Mercedes-Benz C240 Questions

See what others are asking about their Mercedes-Benz C240. Get answers from RepairPal's community of auto experts and enthusiasts.
The car run great, but at idel run rough. nor sure if filter air or fuel. 80k miles. engine check light on dash
When i start my c 240 it idles and runs rough, like a vibration, but when it warms up it smooths out. could this be ...
Mercedes-Benz C240 Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Mercedes-Benz C240 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