Fixing the check engine light (P0420, P0137 & P2270) | Subaru WRX (2015-2021)

Hey everyone!
So the Subaru WRX decided to give me a check engine light (CEL). Which gave me a heart attack because it's a Subaru. The CEL codes (P0420, P0137 & P2270) were all related to the 02 sensor so I replaced it with a DENSO (Part #: 234-4988) one. They make the OEM sensors for this car.
Replacing the sensor fixed the car! I should have noticed the symptoms earlier for the bad 02, weird idle on start up (sometimes stalled out), and smelly exhaust fumes (like rotten eggs).
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