Oxygen sensor question

Hi All, I just got a 2021 GT with less than 5K miles on it, and the check engine light came on while driving. The OBD reader threw a P0157 code - problem with bank 2, oxygen sensor 2. When I brought it to the dealer, they reported it as “low voltage” on the sensor. Then they explained that it had to do with the battery being not properly tended, which seems odd given that the battery was pretty close to fully charged. At any rate, they cleared the code and all is well.

Has anyone...

Oxygen sensor question