This car is driving slowly insane

I’ve been working on this 01 solara v6 model for almost a month now. I picked it up drove it for 2 days on my drive home from work it threw a check engine light at me and once I got home I turned it off and it wouldn’t turn back on. I replaced the ignition switch because it didn’t even crank before. It cranks not over checked the starter the fuses the battery the grounds replaced the spark plugs and coil packs replaced the fuel pump and cleaned out the injectors and worse of all it’s throwing no codes so no I’m even more confused