the sensor on back of my inside mirror came loose how do i reattach it
Yoay have remove the mirror and see if it comes apart and reattach the auto dim sensor or just replace the whole unit. If you replace the unit you could try to find a tested used unit off ebay, its probly way cheaper than the stealership.
like this: http://www.ebay.com/itm/2011-ML350-4MATIC-Interior-Rear-View-Mirror-482956-/281608721701?hash=item4191301525&vxp=mtr
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