[Zeth]

PHP Code:

mysql_format(dbhandle, query, sizeof(query), "INSERT INTO `server_vehicles` SET Model='%d',Color1='%d',Color2='%d',PosX='%d',PosY='%d',PosZ='%d',PosA='%d'", 


Here the format specifier is wrong, here posx, y, z and a have been declared as Float, therefore you need to follow the correct format.
here is the corrected line.

PHP Code:

mysql_format(dbhandle, query, sizeof(query), "INSERT INTO `server_vehicles` SET Model='%d',Color1='%d',Color2='%d',PosX='%f',PosY='%f',PosZ='%f',PosA='%f'",