2013 Equinox LS, 4 cyl, 48k miles. Note, pistons, rings, and timing chain replaced at 42k.
After ~4 or 5 minutes of driving the CEL light came on and stayed on for the remainder of the drive. The OBD-II reader showed a P0037, HO2S Heater Control Circuit Low (Bank 1 Sensor 2) code. I believe it indicates a fault in the heating element of downstream O2 sensor. I cleared the code and it did not come back during the ride to work. The CEL did not affect driveability as far as I could tell.
Any suggestions on what to check? I’m not sure if this is covered under the Emissions 8/80k warranty, the book was a bit vague on the matter. If the light reappears, I will call the dealership.