CREATE TABLE table_79391 ("Model" CLOB, "Years" CLOB, "Engine code" CLOB, "Power" CLOB, "Torque" CLOB)

What is the engine code of the xdrive23d model?
SELECT "Engine code" FROM table_79391 WHERE "Model" = 'xdrive23d'
SELECT "Engine code" FROM "table_79391" WHERE "Model" = 'xdrive23d'