Subaru LEGACY Service Manual page 14

ENGINE (DIAGNOSTICS)
(9)
(1)
(1) Front oxygen (A/F) sensor
(2) Rear oxygen sensor
(1)
(3)
Electrical Component Location
EN-02547
(3)
(4)
(2)
(3) Front catalytic converter
EN-02091
EN(H4SO 2.5)(diag)-12
(4) Rear catalytic converter
(2)
(4)
EN-02092
EN-01973