Toyota Repair Problems? Ask a Mechanic for Answers ASAP
Hi Brian and welcome to JustAnswer,
The 02 sensor connector is routed under the driver's side seat. It's beneath the carpet near the foot air ducts. Sometimes, you can gain access to the connector by reaching underneath the seat, near the air ducts and unplug the connector. If you can't you will need to unbolt the driver's seat.
The 02 sensor is a 4 wire connector.
Let me know if you need additional help.