It isn't turning Off What should i DO
 

I have the P0139 CEL on. I have it disabled on EcuFlash but it still comes on.
On top of that IDK why its on I still have the stock cat and the sensor has never been removed.

Any help is appreciated.
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If you are not a troll/bot, learn to post properly and stop linking to spam, and then replace the O2 sensor.