Auto parts stores read them for free.
Regardless, if you have a check engine light you will spend a lot less in the long run by paying for diagnostics. The alternative is to start guessing and throwing parts at the car. You will quickly spend a lot more this way.
So make some calls to auto parts stores in the area to make sure they’ll pull the codes. Then have them read. Write down the exact codes and post them (format of codes: “P1234”)
Either way, this is not going to be something simple like “oh, just replace fuse number 6” or something.