bajaleo

Just got these coes today.

Did some searching and youtubing and seems to point to a dirty MAF. Coincidentally I just had a coolant refresh done at my local dealer and I'm wondering if they left something loose. There's a youtube video showing a loose fitting on the back of the air box on an E class that caused codes to pop. Next step is to take my airbox off and inspect connections and tubes. Then look at the MAF connections.

Anyone else gone through this already?

Thanks, Leo