Subaru IMPREZA GD 2007 Series Manual page 1856

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Diagnostic Trouble Code (DTC) Detecting Criteria
AD:DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
1. OUTLINE OF DIAGNOSIS
Detect continuity NG of the 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)
(1) Atmosphere
(2) Exhaust gas
(3) Electromotive force
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Rich
GD(H4DOTC)-65
GENERAL DESCRIPTION
(E)
(A)
(C) (B)
(D) Lean
(E) Theoretical air fuel ratio
(F) Comparative voltage
(F)
(D)
EN-01696