The dealer performed the N23 recall 2 months ago when it was in for an oil change. Of course I get a foot of snow dumped on me last week....and I get the '4WD service needed ' message when I tried to get into 4LO. Check out the problem on line, find out I'm not the only one. Called the dealer and I get the "Never heard of that happening" reply. I know it worked before, I put it into 4LO about once a month to make sure everything still works. So here I sit at the dealer, wish me luck.