What are the engine light codes and their meanings?

What is your question?

engine light is on. I have installed new down stream O2 sensors. Upstream sensors replaced last spring. What are the codes and what do they mean? It's a 6.2 l gas engine.

What makes this problem better or worse?

hesitation when starting cold.

How long has your 2010 Chevrolet Silverado 1500 had this problem?

a few weeks