dodgec24

2018 C300, usually turn off the auto/start stop. Left it on, think I had a misfire, 44k miles. Check engine light on.

Is this why Mercedes recommends 50k spark plug replacement? For the auto start/stop?

Hoping to run it a few cycles and see if the light turns off. Anyone have any experience with this?

chassis

50k plug change interval has been in place for some time and applies to models without start/stop.

Keith66

I can't see how the stop/start system would have any bearing or effect upon the spark plugs, so it's unlikely the two are related.

The best plan of action is to retrieve the code(s) that triggered the CEL to give you a better idea of what is failing.

Good luck!

dodgec24

I brought it to the MB dealership, luckily I have an extended warranty. I am hoping its nothing severe.

Andy74

I don't see the relationship between the two. Please share the root cause and solution so we can benefit from your experience.

dodgec24

Will do, car is at the dealer, will update thread once I hear back from service techs.

dodgec24

Issue was crankcase vent valve, replaced at dealership. No check engine light now.