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Mercedes-Benz E350 Questions

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The "auxiliary battery malfunction" appeared, so the aux battery was replaced. Still reappears every couple of days. Also, had the "cruise control inoperable" appear, but the next day it was working. Another day the automatic lights feature was inoperable, Next day it was fine. Do I need a new computer or an update?
Should also tell you that last January there was some sort of computer failure that would not allow the vehicle to shift into gear from park, with a red alert "do not shift gears, service required". Repaired: "M.E. was taking down can bus. Replaced M.E. and profgrammed."
I have a warning message on my dashboard indicated auxiliary battery malfunction, but I cannot located that battery
2008 Mercedes Benz E350 4Matic
2008 e350 4matic sunroof fix cost
interior wood strips coming loose on dash, doors and in rear seating. issue does not include areas where power seats and locks are controlled. MB says ongoing problem with MB convertibles in southern states but not willing to fix it

How long have you had this problem? For 3years haven't changed nothing yet
where is the auxiliary battery location on my 2011 e350 sedan. Thanks
Is this the transmission?
It started declining when I had my transmission flushed at 47K miles. I now have 65K miles and all of my regular maintenance has been done. Nothing else seems to be wrong with the car.
What seems to make the problem better or worse? my avg gas mileage has been going down 24 now down to 19
How long have you had this problem? one year
It just happened while driving on the freeway
The mechanic is saying that the fuel tank has only one open hole for fuel plumb. The other hole is capped. We need to replace the tank since we can not just replace the plumb. The car smell gas and will not start without spraying fuel injection. I can be reached at 770-851-1014. Thanks a million!
This has only happened 3 times since owning the car but when I shift from Park to Drive the transmission does not go into gear. The front screen says D but the engine just revs. Last time this happened it took 3 restarts to make it engage Drive.
I have a 2015 E 350. My auxiliary battery malfunction alert came on, so I ordered a battery. I was shipped a small battery about 3 inches long and I have no idea where or if it goes in my car. Any ideas?
Auxiliary battery malfunction light is on
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