Alpine Formula 1 academy driver Maini beat team-mate Gabriel Bortoleto by 0.219s in the qualifying shootout in Bahrain on Thursday afternoon.
However, following a post-race inspection of his Invicta-run car, it was found that the height of the left undertray front external strake was below the required height.
All of his times from qualifying were deleted and will see the Indian drive start both the sprint and the feature race from the back of the grid.
A statement from the FIA on the matter read: “In respect of Car 9, the left undertray front external strake in the area defined in the Technical Delegate's report was outside the thresholds outlined in Articles 3.4.1 and 3.4.2 of the 2024 Formula 2 Technical Regulations.
“Disqualification of Car 9 from the results of the Qualifying Session. Removal of all times set by Car 9 in the Qualifying Session. All cars originally classified behind Car 9 are moved up one place in the Qualifying Session classification.
“Permission is given for Car 9 to start the Sprint Race from the back of the grid after any other penalties are applied. Permission is given for Car 9 to start the Feature Race from the back of the grid after any other penalties are applied.”
Source: Autosport