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HOMESERVICE MANUALSSUBARU2014OUTBACK 2.5I, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 11 (ENGINE CONTROLS (DIAGNOSTICS) (H6DO))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0154: O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)WIRING DIAGRAM
2014 Subaru Outback 2.5i, Standard Trans

DTC P0154: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1): Wiring Diagram

2014 Subaru Outback 2.5i, Standard TransSECTION Wiring Diagram
WARNING: This page is about a different variant/trim than selected.
  • Engine electrical system, 3.6 L model (without push button start). See appropriate SYSTEM WIRING DIAGRAM article.
  • Engine electrical system, 3.6 L model (with push button start). See appropriate SYSTEM WIRING DIAGRAM article.
    Fig 1: Front Oxygen Sensor Wiring Diagram
    G07910522Courtesy of SUBARU OF AMERICA, INC.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connectors from ECM and front oxygen (A/F) sensor connector.
  3. Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.

    Connector & terminal 

    (B135) No. 8 - (E24) No. 3: 

    (B135) No. 20 - (E24) No. 4: 

 Is the resistance less than 1 Ω? Go to step 2  . Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit in harness between ECM and front oxygen (A/F) sensor connector
  • Poor contact of coupling connector
2 CHECK FOR POOR CONTACT. 
Check for poor contact of ECM and front oxygen (A/F) sensor connector.		 Is there poor contact of ECM or front oxygen (A/F) sensor connector? Repair the poor contact of ECM or front oxygen (A/F) sensor connector. Replace the front oxygen (A/F) sensor. Refer to FRONT OXYGEN (A/F) SENSOR .
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.