If the outside handle doesn't work that's usually if the cable is not relaxing enough to grab internally.

Lift the arm with a tool or finger to see if you can release the latch manually to determine if this is what's happening.

If the end of the cable rusts it can make the outer cable longer and it can set up for this failure mode. Over had to cut some of the outer cable off to resolve this issue.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)