Possible Causes

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Malfunction is detected when fuel injection system does not operate in closed loop. Possible causes are:

HO2S1 circuit open or shorted.
Defective HO2S1.
Defective front HO2S1 heater.

NOTE: If DTC confirmation test has been previously performed, always turn ignition off and wait at least 10 seconds before performing next DTC confirmation test.