Powdered graphite worked wonders on an old Mercedes of mine, something like this:
https://www.walmart.com/ip/Hillman-Powdered-Graphite-Lubricant/17011322
https://www.walmart.com/ip/Hillman-Powdered-Graphite-Lubricant/17011322
Remote won't unlock door and and can't stick key in door lock
Just picked up this 2011 today. Remote seemed to work fine this morning as well as the door lock. Tonight when I try to unlock it with the remote, the lights flash 3 times but none of the locks do anything. Same thing happens if I press the other two buttons. 3 flashes. Battery in the remote bad? It works from 50 feet away. Wouldn't be too bad if I could at least open the door with the key but the blade won't all the way in all of a sudden.
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WD40 works from experience prior to the graphite. But it eventually accumulates dirt and since it is electrical somehow I switched. I realized your title says the door locks don’t work, was the ignition re-keyed in it’s past?....
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