Rear Oxygen Sensor: Inspection

Check the rear oxygen (A/F) sensor for deformation, cracks or other damages.
Check the resistance between rear oxygen (A/F) sensor terminals.

Fig 1: Checking Resistance Between Rear Oxygen (A/F) Sensor Terminals
Courtesy of SUBARU OF AMERICA, INC.

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