hello every one i have mercedes W221 S500 model 2008 and there are misfiring in lift side in the four cylinders and i replaced all spark plugs and all ignition coils and disassembly the all engine to check the pistons and the valves ... etc and still there is misfire and i replaced air mass and the injectors and still there is misfire and replaced 3 engine control unit and still there is misfire in the same side and i replaced the o2 sensors and still there is miss fire in the same side

there is any one can help me

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Profile picture for user Markthemechanic

Oh wow!

To be honest, I have never heard of this happening to anyone.

I can see the car is 10 years old and these problems might occur, but were you ever in a bad accident?

From what it seems, the Engine is failing and it might be very bad news...

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