Disconnect EVAP???

[Bmwtvboy]

MY X is old. It has been great. Recently, EML, never had that light on before. NEVER. Came on while SES light is on. X is at temp.
Rich codes (P0175/172). I noticed the X was running so smoothly over the past 2 months. I changed to regular gas and still got great MPG. No issues. After it sat for 2 hours, started up, no EML, but SES stayed on. Checked codes, cleared them out.
If it is the O2 sensors(4)@165Kmiles, or the Cats, they're original 249K miles.
How do I disconnect the entire EVAP system? I found the head/breather plug on Amazon. What about the Sensors? Do I need special software to close it down? I really don't want to spend hundreds on cats or O2/s at this point. Updated the DVanos at 200Kmiles. Recently did tranny/filter/fluid and it drives/shift beautifully. 90% of this X is original '01 mechanics/electrical systems.
What are my options?
I spent a small fortune to fix the trifecta, but it only worked for about a year. Trifecta back on, but the X drives great. Realize, I am in FL. A/C system, original and works ice cold.
What to do? I really like this old X. I have done much of the work myself.
I appreciate any advice and counsel. You guys have always been great.
I don't have any fancy software / diagnosis tools yet. Just a small scanner.
Thanks.