Hello, I’m not a mechanic at all but trying to find out some info. I have a 2015 trac with 65,000 miles. I just got a check engine light and on star sent me an email saying it’s a code P0420. After searching, I found the most probable cause for this is the upstream O2 sensor being faulty so I went to Auto Zone and purchased a new one (I got the OE Bosch one) I removed the old sensor, put in the new one and the light hasn’t gone out. I’ve driven it a couple of times since replacing the sensor but not very far (maybe 10 miles in total). My question is, should the light have gone out by now if the problem was the that O2 sensor or will I have to drive it more? I don’t have the OBDII reader to clear the code so was hoping if the problem was resolved, the light would go out on its own.