Do I need any special tools or adapters to install this?

No adapters needed — this sensor threads directly into the factory location. You'll need a basic oxygen sensor socket or wrench to remove the old unit and install the new one.

Will this clear a check engine light if the old sensor is bad?

If your check engine code is tied to the rear O2 sensor, yes — a new sensor should resolve it once installed and the system recalibrates. If the code stems from catalytic converter efficiency or other causes, you'll need to diagnose further.

Do I need to disconnect the battery before swapping this out?

Disconnecting the battery is not required for sensor replacement, but it's common practice to eliminate any electrical codes that might fire during the swap. Your call — either way, expect the system to relearn after install.