Subaru 2009 IMPREZA Service Manual page 776

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AE:DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED
(BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect open circuits of the sensor.
Judge as NG when the impedance of the element is large.
2. COMPONENT DESCRIPTION
(2)
(4)
(A) Electromotive force
(D) Rich
(1) Atmosphere
(2) Exhaust gas
3. ENABLE CONDITIONS
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
(3)
(1)
(2)
(B) Air fuel ratio
(3) ZrO
2
Enable Condition
GD(H4SO)-52
(A)
(C)
(C) Lean
(4) Ceramic heater
(B) (D)
EN-01693