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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0139 O2 Sensor Circuit Slow Response (Bank 1 Sensor 2) >> Enable Condition

Enable Condition

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Rich → lean diagnosis response

ENABLE CONDITION CHART

Secondary Parameters Enable Conditions
Battery voltage > 10.9 V
A/F sub feedback control condition Completed
Deceleration fuel cut time is 6 seconds or more. Experienced
After fuel cut ≥ 2 sec.
Rear oxygen heater current calculation time ≥ 60 sec.
Rear oxygen heater current continuous time ≥ 30 sec.
Catalyst warm-up counter ≥ 9000


Lean → rich response diagnosis

ENABLE CONDITION CHART

Secondary Parameters Enable Conditions
Battery voltage > 10.9 V
A/F main feedback control condition Completed
Deceleration fuel cut ≥ 6 seconds Experienced
After fuel cut ≥ 2 sec.