Rear Oxygen Sensor: Inspection

1. Check that the rear oxygen sensor has no deformation, cracks or other damages.
2. Measure the resistance between rear oxygen sensor terminals.

Fig 1: Identifying Rear Oxygen Sensor Connector Terminals

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Standard
1 and 2	5.6+0.8M-0.6 Ω (when 20°C (68°F))