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Mercedes-Benz ML350 Questions

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My COMAND system is not be able to turn on. Not be able to use the radio, navi, phone, CD player and everything on that unit. I have waited for few days, and seems it is totally dead. Is there anyone knows what is the price range to get the COMAND replaced in the dealership?
car was running fine until I replaced fuel filter now it sets codes po172 po175 what happen
car was running fine until I replaced fuel filter now it sets codes po172 po175 what happen
car was running fine until I replaced fuel filter now it sets codes po172 po175 what happen
Drove approximately 3 miles with a/c working fine with very cold air as usual then parked and turned engine off. Got back in after 30 minutes and started engine and a/c blew only hot air.
What wrong
it may be some fuse problem but i do not know
Water got into my gear from the roof.
Ac and Heat air, comes out of all the vents. I turn the knob to either use the defroster or ac in the cab but the air flows from all vents
faint whining at idle
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