Good morning everyone this morning I turned on my Mustang to a check engine light. There seems to be no problem with the engine that I hear when on stall mode and it drives normal I don’t have a code reader yet and I don’t really wanna go to a dealership or shop because of there high *** prices. But what can be common issues for this? I’m only at 40k miles as well.

 

Welcome to the forums, please take time to learn how things are arranged. Every generation has its own sub forum for questions like yours. And then there are other sub forums for different discussions.
You posted your question in the sub forum for:
So unless somehow using the forums is causing your CEL, you are in the wrong sub forum.