2019 Onward Kohler Issues

[Vince B333]

Anyone else purchase a 2019 Onward with Kohler engine? Been having problems with it when first starting up and taking it for a ride down an inclined street. Incline not much, but you typically would not push throttle to floor during the descent. Onward starts to putter and continues to do so once on level ground. Next thing engine light comes on with it still no longer reaching more than 2200 rpm or maybe around 12 mph. Took it in to dealer and they are stumped. Club Car sent out a new O2 sensor and new computer. Worked about 2 days and same deal. Club Car claims that it has something to do with O2 sensor and computer, but neither they nor Kohler can seem to figure it out. Claim that is making it run lean. Their latest thing was to uncouple wire harness to O2 sensor and unplug check engine light. I must admit that it runs like a champ now, but doesn't seem to be the right thing to do. Dealer has had it now on four different occasions trying to fix and says another customer with same rig is experiencing identical issues. Anyone else? Almost ready to pursue a lemon law claim. Any help, etc. appreciated.
Thanks,
Vince