[Bassment]

The diagnostic is:

Code P0158

Heated oxygen sensor (HO2S) 2, bank 2 - high voltage

If I clear the engine light, the next time I run the car it comes back on after about 5 minutes.

I haven't noticed anything weird with the engine or with fuel economy.

Should I just replace the sensor? Is there any other diagnostic I can do?

It's a 2016 Camaro 2SS, 115,000 km

Which part do I need? It's a bit confusing if it's upstream/downstream or what side the sensor is on.

Is this something I need to immediately replace? Or can I drive it for a few more months and replace it when its warmer out? (I'm in Canada)

[Bassment]

The part I found is:

GM GENUINE 12643708

It suggests replacing both sensors at once?

[easttxss]

There are 4. 2 before the cats(upstream) and 2 after(downstream). They don't last forever, but for now you can just replace the one that is throwing the code. Bank 2 Sensor 2 is the passenger side, rear sensor. The rear sensors only monitor the cats, they do not contribute to the way the engine runs.