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Just graphed it with engine warm. At idle it looks like this: Bank 1 Sensor 1 is cycling between about 0.1 and 0.8, not dropping to zero. Bank 1 Sensor 2 is an almost flatline up close to 0.8 Did a reset and cleared the codes. We'll see if they come up again.

There was no code for the O2 in the fault log, only the O2 "Not OK" error on the vehicle test results. (This is using the Torque android app.)

Engine light came on in wife's 2013 Grand Caravan (115k miles). Cheapo scanner shows PO420 Powertrain: and low voltage for O2 Bank 1, Sensor 1: I'm making the assumption that the O2 sensor is the likely culprit and plan to change it out as a first step. Is this a good assumption given these...