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Home >> Subaru >> 2001 >> Outback Base, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 2.2L & 2.5L >> Diagnostic Tests >> DTC P0139: Rear Ho2S Circuit Slow Response

DTC P0139: Rear Ho2S Circuit Slow Response

Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . If DTC P0136 exists, diagnose and repair that DTC. Further inspection of DTC P0139 is not necessary. If DTC P0139 is only DTC set, replace rear HO2S. Clear memory and perform verification procedure. See CLEARING DIAGNOSTIC TROUBLE CODES  and VERIFICATION PROCEDURE  .

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