O2 sensor P2197 fault

Hi all, My 2020 gen 1 MT10 had the eml on last week when I started the Bike. Checked Battery voltage and it was sitting at 12.52v, crank over seemed a little slow so I ordered a new battery. This morning I connected my OBD2 reader and got the code to say O2 sensor biased/stuck lean.cleared the eml light and run a live stream where I could see one bank was stuck on 0.875v to 0.895v. I put in the new battery I had ordered and run live stream again and both banks were running pretty close and I could smell the petrol fumes as it was before said fault...Question is? Is it the new battery that fixed it or did it reset itself when replacing the battery? Its seems sorted so I am 😊