Rx300 Sensor Failure After Battery Replacement

[Chuck1]

About 5 years a ago I replaced a failing battery. About a week later an oxygen sensor failed. Two weeks ago I had to replace the battery and a week later an air-fuel ratio sensor failed.

Is there some step in the replacing battery procedure that I need to be doing, or are these failures just coincidence?

[Filehorse]

Unless there were smoke and flames involved when you replaced the batteries, this should be simple coincidence. There is nothing about those two components that should be sensitive to properly changing out a battery.