2012 Mercedes-Benz ML350 Questions

All 2012 Mercedes-Benz ML350 Questions

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I live in Colorado and snow treating chemicals are inevitable. I was my car soon after any snow, but the chrome is becoming pitted and discolored. Seems strange for a car this new. Its always garaged and cared for....
it usually on comes on in cooler weather- it went out this summer after the winter and is back now in cooler weather
CEL came on suddnly with image of an engine
suddenly a lighted engine sign came up on dashboard
Where is the cabin air filter located and how to change it? Thanks
It occurs ever time I back out of the garage. I have less than 4,000 miles The groaning or moaning sound goes away when shifting into forward
where is it located, how do i remeove it from my 2012 ML350 V-6 4-matic (gas)