You can replace just the screen only. CPO normally doesn't cover the NAV since they Consider it an aftermarket accessory even from factory. It is stupid. Call BMW NA and ask them for any help towards it. How many miles on car? Also check your state for reasonable merchantability laws regarding warranty.

Never hurts to ask. Your SA should also help you get some help on covering the cost or labor since it isn't cheap. You an find screens sometimes on eBay or ask around. They are easy to install.

Good luck.

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