DTC 33/P0130 - Front Oxygen Sensor (O2S)

1. Check Input Signal Circuit
   
   Turn ignition off. Disconnect O2S harness connector and ECM harness connector. See Figure and Fig 1 . Check harness continuity between ECM connector terminal No. 46 and O2S connector terminal (White wire). See Figure. Continuity should be present. Check for continuity between ECM connector terminal No. 46 and ground, and between O2S connector terminal and ground. Continuity should not be present. If continuity is as specified, go to next step. If continuity is not as specified, repair harness or connectors as necessary.
2. Check Component
   
   Loosen and retighten engine ground screws. Disconnect and reconnect wiring harness connector. Disconnect ECM and O2S wiring harness connector. Check pin terminals for damage or corrosion. Repair if necessary and perform FINAL CHECK . If fault is still present, replace front O2S sensor.

Fig 1: Locating Front O2S Harness Connector

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: DTC 33, Checking Input Signal Circuit

Courtesy of NISSAN MOTOR CO., U.S.A.