Mercedes-Benz S500 Rough Idle

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

What are common reasons my Mercedes-Benz S500 has a rough idle?

While there are a variety of reasons your Mercedes-Benz S500 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 S500 Questions

See what others are asking about their Mercedes-Benz S500. Get answers from RepairPal's community of auto experts and enthusiasts.
My 1995 s500 with 96000 miles runs rough while idle. while driving it seems to run fine. i have changed plugs,wires,r...
I brought this car in 2008 with 85,000 miles im the only one thatdrives this car, it sits during the winter months n ...

Related Mercedes-Benz S500 Problems

Find the most common driver-reported problems that are to blame when a Mercedes-Benz S500 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 S500 Repairs and Prices
All costs based on RepairPal Fair Price Estimate™ averages. Actual prices may change depending on final diagnosis.

Mercedes-Benz S500 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