trans has a metalic scraping noise when shift to gear when cold.

What is your question?

This happens when first started in the AM. Noise last only 15 seconds or so, but then it shifts fine and no noise the rest of the day. Just had transmission replaced. No noise when in nuetral or park. Also had oxygen sensor replaced, but have check engine light on and no traction control. Problem shows as code 21 for the oxygen sensor. Anyone familiar with like problems?