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

Standard oxygen sensor socket and a wrench is all you need — sensor threads directly into the factory mounting hole with no adapters or modifications required.

Will this trigger a check engine light?

Only if the old sensor was already faulty or if the connector is damaged during removal. Once installed and warmed up, the system should clear any pending codes related to the rear sensor circuit.

How do I know which one I need — left or right?

Left and right refer to the vehicle's bank sides (driver side and passenger side). Check your service manual or the location of your current sensor to confirm which bank you're replacing.