I have 2015 Ml350 with 54,000 miles that has random miss fire on cylinder 3 with code P030385.

When I take vehicle to dealership they say they do not see any codes and cannot replicate.



Is your check engine light currently on? Was it on when you took it to the dealership?

Fisi, February 13, 2020

Hi Homer

The P0303 code means that the cylinder 3 is misfiring or is randomly misfiring.

P0303 - MERCEDES-BENZ Possible Causes: Faulty spark plug 3, Clogged or faulty fuel injector 3, Faulty ignition coil 3, Fuel injector 3 harness is open or shorted, Fuel injector 3 circuit poor electrical connection, Ignition coil 3 harness is open or shorted, Ignition coil 3 circuit poor electrical connection, Insufficient cylinder 3 compression, Incorrect fuel pressure Intake air leak. Have a great day, hope this will help you.

Isaac, March 28, 2021

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