April 5, 2026: LEMON Manuals is launched! Read the announcement.

Front Oxygen (A/F) Sensor: Inspection

Check that the front oxygen (A/F) sensor has no deformation, cracks or other damages.

Measure the resistance between front oxygen (A/F) sensor terminals.

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.	Standard
2 and 3	2.5-4.0O (at 20°C (68°F))