[BroZeus]

it should be

pawn Код:

public OnPlayerKeyStateChange( playerid, newkeys, oldkeys )
{
    if ( IsPlayerInAnyVehicle( playerid ) )
    {
        if ( (newkeys & KEY_YES) !(oldkeys & KEY_YES) )
        {
            new Float: zAng;
            GetVehicleZAngle( GetPlayerVehicleID( playerid ), zAng );
            SetVehicleZAngle( GetPlayerVehicleID( playerid ), zAng );
            GameTextForPlayer( playerid, "~r~Vehicle Flipped!", 3000, 3 );
        }
    }
    return 1;
}

the code u sing will work but it will have bugs use the above one see the changes in "if" line
the bug is that if the y key is being pressed and during it has been presed and some other key is pressed then the vehicle will flip again read https://sampwiki.blast.hk/wiki/OnPlayerKeyStateChange carefully