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4. Detect Malfunctioning Part

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.

Check the following.

Harness for open or short between ECM and HO2S1
Harness for open or short between HO2S1 and ground
1. : Repair open circuit or short to ground or short to power in harness or connectors.