Subaru LEGACY 2006 Manual page 503

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AF:DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect the contiunuity NG of oxygen sensor. If the oxygen sensor voltage reading is not within the probable
range considering the operating conditions, judge as NG.
2. COMPONENT DESCRIPTION
(3)
V
(2)
(A) Electromotive force
(B) Air fuel ratio
(1) Atmosphere
(1)
(2)
(C) Rich
(D) Lean
(2) Exhaust gas
GD(H4SO)-66
(E)
(A)
(C) (B)
(E) Theoretical air fuel ratio
(F) Comparative voltage
(3) Electromotive force
(F)
(D)
EN-01696