What are the common signs that indicate spark plugs need to be replaced in a Mercedes-Benz S-Class?

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What are the common signs that indicate spark plugs need to be replaced in a Mercedes-Benz S-Class?

I’m not sure how to tell if the spark plugs in my Mercedes-Benz S-Class are failing. What symptoms should I look out for that suggest my spark plugs need inspection o r replacement?

Talha Kyanii asked on 11 Oct 2025 17:50:53 pm

1 Answer

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Gari Master - on 11 Oct 2025 17:53:08 pm

Look out for these symptoms indicating that your spark plugs might need replacement:

* **Engine Misfires o r Hesitation:** Noticeable jerking o r hesitation during acceleration.
* **Rough Idle:** The engine runs unevenly o r shakes at idle.
* **Decreased Fuel Economy:** You notice you’re refueling more frequently.
* **Hard Starting:** The engine struggles o r takes longer to start.
* **Check Engine Light:** The ECU may detect misfire codes o r ignition problems and trigger the warning light.
* **Poor Acceleration:** Reduced power when pressing the accelerator.

If you observe any of these signs, it’s best to have the spark plugs inspected and replaced if necessary.