Kiwi Liam Lawson has been stripped of his Formula Two Monaco sprint race two victory, being found to have a "technical non-conformity."
The 19-year-old started second on the grid after a ninth-placed finish in the weekend's first sprint race and took the lead in race two with a clinical overtake of Australia's Oscar Piastri.
But even after racing away to take the record flag, the drama wasn't over for Lawson.
Investigations by race officials found Lawson had used a different throttle map at the start of the race, in breach of Technical Regulations, Article 3.6.5.
"The drivers are required to use a defined throttle pedal progressivity map programmed in position 1 of the steering wheel throttle map rotary knob during all formation lap starts and race starts until the car speed reaches 50kph," Formula 2's official statement says.
Lawson's disqualification meant second-placed driver Dan Ticktum was awarded the race victory.
The Kiwi finished the weekend with seventh place in the feature race - giving him six points towards his push for the F2 championship.
Lawson is fifth in the championship with 36 points from his six races, two behind Ticktum.
Guanyu Zhou, who won the opening sprint race and picked up fifth in the feature race, leads the championship with 68 points, 32 ahead of Lawson.
Fellow Kiwi Marcus Armstrong is 15th in the championship, after having to start the second sprint race from the pit lane despite having taken pole position earlier in the weekend.