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So Benz 2 is back at dealers, I am in the Bay Area, not particularly cold this morning, went to get breakfast and 5 min later engine light and loss of power, checked fluids, temp all ok, drove back home,
Towed to dealer for them to see tomorrow. No mods on engine or pedal.
I had the misfire message a few years back on my BMW 335i - it turned out to be bad fuel (water or other gunk in the gas). The dealer cleared the message and put a fuel additive/conditioner in. After running through a fresh tank of gas, I never got the message again. It could be as simple as that OR it could be a bad plug, bad plug wire, etc.