The code indicates an issue with the air/fuel sensors. There are two of them. Were both replaced? If you look at the attached pic below, I highlighted their locations.
As far as a low voltage issue, it could be corrosion at the connector. Also, it isn't uncommon for a wire to break down due to heat and basically create excessive resistance.
Let me know if both have been replaced. Also, if they have, let's confirm there isn't an issue with the sensor itself. Here is a link that explains how to check one:
Let me know.
See pic below.
Monday, June 14th, 2021 AT 9:03 PM