4. Check Harness Connector

1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
   Fig 1: Disconnect A/F Sensor 1 Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check harness connector for water.

   Water should not exit. 

OK or NG 

1. OK: GO TO 5.
2. NG: Repair or replace harness connector.