a camshaft assembly includes a cam carrier and a camshaft that is rotatable relative to the cam carrier in a first configuration and fixed against rotation in a second configuration . the assembly further includes a cam target wheel that includes notches , a first and second half - wheel , and a groove . the assembly additionally includes a camshaft position sensor holder that includes a camshaft sensor bore that provides access to the groove . also , the assembly includes a camshaft position sensor received in the camshaft sensor bore in the first configuration . moreover , the assembly includes a locking mechanism received in the camshaft sensor bore in the second configuration . the locking mechanism includes an engagement member configured to selectively engage the groove for locking the camshaft into position relative to the cam carrier .