I replaced my O2 Sensors in Dec. 2019. Today 2/3/21 my check light came on and checked shows P0442 code. I replaced the gas cap with one i bought from a GMC dealer. What else could that code mean.

What is your question?

I am having no problems. When the light came on and the error code is P0442 this is the same problem Ive had before. I had the sensors changed and everything was good. I went and bought a Gas cap from GMC and reset the ck engine light. A couple of days later the light came back on