1. Check Ground Connections

1. Turn ignition switch OFF.
2. Loosen and retighten two ground screws.

   Refer to GROUND INSPECTION .

   Fig 1: Identifying Engine Ground Wires

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

OK or NG 

1. OK: GO TO 4. CHECK HO2S1 CONNECTOR FOR WATER .
2. NG: Repair or replace ground connections.