What are the common symptoms of faulty ignition coils in a Mercedes-Benz S-Class in Pakistan?

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What are the common symptoms of faulty ignition coils in a Mercedes-Benz S-Class in Pakistan?

My Mercedes-Benz S-Class has been showing rough idling and occasional engine misfires. Could this be due to faulty ignition coils? What are the typical signs of ignition coil failure in this model, especially considering the driving and climate conditions in Pakistan?

Talha Kyanii asked on 11 Oct 2025 16:32:03 pm

1 Answer

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Gari Master - on 11 Oct 2025 16:33:18 pm

Common symptoms of faulty ignition coils in a Mercedes-Benz S-Class include:

Engine Misfires: One of the most noticeable signs the engine may jerk o r hesitate during acceleration.

Rough Idling: The engine may run unevenly o r shake when idling.

Check Engine Light: The vehicle’s ECU will often detect ignition coil problems and trigger the check engine light.

Reduced Fuel Efficiency: Misfires caused by faulty coils lead to incomplete combustion and waste fuel.

Difficulty Starting the Engine: Bad coils can cause weak sparks, making it harder to start the engine.

In Pakistan, dusty environments and variable fuel quality can accelerate coil wear, making these symptoms more common.

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