[Virtual1ty]

pawn Код:

if(strcmp(cmdtext, "/autotune", true) == 0)
{
    new VehicleID;
    VehicleID = GetPlayerVehicleID(playerid);
    
    if(IsPlayerInAnyVehicle(playerid)== 1)
    {
        GameTextForPlayer(playerid,"~b~Car modded!", 4000, 5);
        AddVehicleComponent(VehicleID, 1087); //hidraulic
        AddVehicleComponent(VehicleID, 1078); // wheels
        AddVehicleComponent(VehicleID, 1010); //nos 10x
        AddVehicleComponent(VehicleID, 1003); //spoiler
        AddVehicleComponent(VehicleID, 1018); //exaust
    }
    else
        SendClientMessage(playerid, COLOR_RED, "You must be in a vehicle");
    return 1;
}

You had 1 missing bracket, and one not needed return expression.