About a week ago my 2015 w205 C300 had a slight jerk every once in a while while idling. Dismissed it for a few days as bad gas but it progressively got worse. Now the check engine light is on and under any acceleration past 3000rpm the car will hesitate and stutter. Overall I’ve been very disappointed in the build quality of this vehicle, coming from a w204. I am out of warranty on this car and really hope this is a MAF sensor or something cheap. I’ll update everyone when I go to the dealer today.

Same thing happened to me, initially was a spark plug issue but long story short ended up replacing the engine with a new one under warranty.

Dealer diagnosed problem as a bad fuel injector and also recommended replacing all of the spark plugs. The error code causing the misfire was a misfire on cylinder 1. Dealer quoted me $1300 for parts and labor. That’s redicluous. I’m going to buy these parts and do it myself. Anything I need to know? Spark plugs I can do easily but I really don’t know anything about replacing the injector. Any direction would be appreciated.

I’m going to attempt to do it myself. The spark plugs are cheap and easy. I have the WIS software from Mercedes and I’ve been looking at the process for replacing the fuel injector, it seems simple enough. I’ll do these repairs myself and I’ll update how it went. Just waiting on parts now.

After changing the spark plugs and coils myself the car runs like a dream. I’m thinking the coils may have been a little much but I did them anyway. The car runs like new and after clearing the codes, everything is perfect. The spark plugs where absolutely horrendous. Spark plugs had 55k miles on them.