The contact owns a 2020 Lexus NX300. The contact stated that while driving at an undisclosed speed, the vehicle stalled. The message ‘Reduced Speed’ was displayed, and the check engine warning light was illuminated. The contact pulled over and was able to restart the vehicle. The vehicle was towed to the dealer, who determined that the cylinder head needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 72,283.