2. Detect Malfunctioning Part

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

Check the following.

Harness connectors M70, F58
Fuse block (J/B) connector M4
15A fuse
Harness for open or short between A/F sensor 1 and fuse
1. Repair or replace harness or connectors.