It does not matter why the O2 sensors were replaced, often when they are replaced, fresh O2 sensors are more active and sensitive and will trigger other codes that older, lazy O2 sensors may miss.

Additionally, with the EXCEPTION of a failed heater circuit, I never see any O2 sensor related codes that are actually for a failed or lazy O2 sensor. Almost any code that references an O2 sensor, with the exception of a failed heater circuit, tend not to be anything to do with O2 sensors.

This is the problem with people that do not think and even the industry Pros, if a sensor is mentioned in a DTC, they automatically condemn the sensor. WRONG, WRONG, WRONG way of doing business.

Addition, there is no O2 sensors testing software that works that I have found, nothing what so ever. I use a $4 App and Log the O2 sensor from cold start. I can find bad O2 sensors all day long that never trigger any O2 sensor codes and that never trigger any DTC's. Any yes, I have more money wrapped up on Pro level tools and software than you have in your vehicle and I still use my $4 App all day long to flag and condemn bad sensors that pass every where else.

The OP does not need to do anything with his current O2 sensors other than to verify the wiring is not swapped Bank to Bank.

I will post an example of some O2 sensors that never had any errors, BUT, they were causing the SAP Readiness Monitor to no turn to Ready/Clear/Pass. I just need to access the files.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.