If you fired up Mario Kart 8 Deluxe recently and noticed something felt slightly off during online races, Nintendo just quietly patched it. Version 4.0.1 is live now, and while it is not the blockbuster update that version 4.0.0 was, it cleans up some genuinely annoying bugs that crept in alongside Switch 2 support.
What version 4.0.0 set up, 4.0.1 cleans up
To understand why these fixes matter, a quick rewind helps. Version 4.0.0, which dropped last month, was a significant free update that brought Switch 2 display support and expanded multiplayer up to 8 players. That kind of change touches a lot of systems at once, and it turns out a few things slipped through testing. Version 4.0.1 is Nintendo's cleanup pass.
The update landed on October 13, 2026, and covers four specific issues. None of them are the sort of thing that makes the game unplayable on standard hardware, but Switch 2 owners in particular will want this downloaded.
The obstacle count bug was the real problem
Here's the thing: the most impactful fix in this patch is the obstacle and Item Box count discrepancy between Switch and Switch 2 during Online Play and Wireless Play. If you were racing on Switch 2 and the track felt busier than usual, that was not your imagination. The game was generating more obstacles and Item Boxes on Switch 2 compared to Switch, which created an uneven playing field in cross-platform lobbies.
That kind of asymmetry is exactly the sort of bug that can quietly skew competitive races without anyone being able to put their finger on why. Getting it fixed is a bigger deal than the patch notes make it sound.
Wii Rainbow Road gets its Star Bits back
The second Switch 2-specific visual bug involved Wii Rainbow Road, one of the most recognizable tracks in the game. A portion of the Star Bits that decorate the course were simply not rendering on Switch 2. Functionally harmless, but if you paid for the hardware upgrade partly for the visual improvements, watching a classic track display incorrectly is not a great look.
Two-player online setup and the crash fix
The remaining two fixes are less hardware-specific but still worth noting. A bug prevented players from selecting a system-registered user when setting up two-player Online Play or Wireless Play. Trying to get a couch co-op session going online and hitting a dead end at the user selection screen is the kind of friction that kills the mood fast.
The fourth fix addresses a crash condition that could close the game unexpectedly under certain unspecified circumstances. Nintendo rarely gets specific about crash triggers in patch notes, but the fact that it made the list means it was reproducible enough to warrant a dedicated fix.
Full version 4.0.1 patch notes
Here is the complete list of changes in this update:
- Fixed an issue where the number of obstacles or Item Boxes would increase during Online Play and Wireless Play on Nintendo Switch 2 compared to Nintendo Switch.
- Fixed an issue where players could not select a user registered to the system when playing with two players for Online Play and Wireless Play.
- Fixed an issue where some Star Bits would not display when driving on Wii Rainbow Road on Nintendo Switch 2.
- Fixed an issue where the game would close unexpectedly when certain conditions were fulfilled.
Small patch, but worth downloading now
Version 4.0.1 is not going to change how you feel about the game. The key here is that it stabilizes the Switch 2 experience that version 4.0.0 introduced, and gets cross-platform online play back to a level playing field. If you are jumping into online lobbies with any regularity, updating sooner rather than later is the right call.
For players looking to get more out of the game beyond the patch, the Mario Kart 8 Deluxe strategy guides cover everything from track-specific shortcuts to item usage. You can also browse the broader gaming guides hub if you want to cross over into other titles while you wait for Nintendo's next move with the franchise.
