Subaru LEGACY 2006 Manual page 447

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
C: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect functional errors of the front oxygen (A/F) sensor heater.
Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large by referring to the
engine condition such as fuel shut-off in deceleration, etc.
2. COMPONENT DESCRIPTION
(1) (2) (3) (4)
(1) Element cover (outer)
(2) Element cover (inner)
3. ENABLE CONDITION
Secondary Parameters
Continuous time where all of the follow-
ing conditions are met
Battery voltage
After fuel cut
Heater current
Front lambda sensor duty ≥ 35%
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after 50 seconds or more have passed since the engine started.
(5)
(3) Sensor element
(4) Ceramic heater
Enable Conditions
30 seconds or more
> 10.9 V
20 seconds or more
Operating
Experienced
GD(H4SO)-10
EN-01683
(5) Sensor housing