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P030485 Misfire

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Old Aug 20, 2025 | 07:52 PM
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MY17 C63s Sedan
P030485 Misfire
Hi folks,

So I've been getting P030485 misfire on cylinder4. Does anyone know if you can use Xentry to check if it is the coils or the fuel injectors? I know I can manually check this by shuffling them but as you know getting these things out is a chore.
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Old Aug 21, 2025 | 09:10 PM
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Originally Posted by amg8
Hi folks,

So I've been getting P030485 misfire on cylinder4. Does anyone know if you can use Xentry to check if it is the coils or the fuel injectors? I know I can manually check this by shuffling them but as you know getting these things out is a chore.



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Old Aug 22, 2025 | 02:23 PM
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Didn't you just post about installing new plugs without indexing them?
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Old Aug 22, 2025 | 03:27 PM
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Originally Posted by user33
Didn't you just post about installing new plugs without indexing them?
Yes. This is separate topic. Didn't want to mesh them together.
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Old Aug 23, 2025 | 01:36 PM
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Originally Posted by amg8
Yes. This is separate topic. Didn't want to mesh them together.
Maybe that's the cause of your misfires.
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Old Aug 23, 2025 | 10:21 PM
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Originally Posted by user33
Maybe that's the cause of your misfires.
realistically no flat rate dealer tech is indexing these and I have not seen any issues on this engine. I will say that it is highly important to get the MB branded logo plugs and you shouldn't have to worry about indexing.
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Old Aug 24, 2025 | 02:04 PM
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Originally Posted by W140King
realistically no flat rate dealer tech is indexing these and I have not seen any issues on this engine. I will say that it is highly important to get the MB branded logo plugs and you shouldn't have to worry about indexing.
I'll go with the stated requirements from the engineers who designed the engine.
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