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Home >> Nissan-Datsun >> 2003 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 403 (Engine Control System) >> DTC P0134, P0154: Ho2S1 >> Diagnostic Procedure >> 2. Check Ho2S1 Ground Circuit For Open And Short

2. Check Ho2S1 Ground Circuit For Open And Short

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect heated oxygen sensor 1 harness connector.
    Fig 1: Identifying HO2S1 Harness Connector
    G00795857Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Check harness continuity between HO2S1 terminal 4 and ground.

    Continuity should exist. 

    Refer to WIRING DIAGRAM .

  3. Also check harness for short to power.

OK or NG 

  1. OK: GO TO 3.
  2. NG: Repair open circuit or short to power in harness or connectors.
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