DTC Confirmation Test

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

NOTE: Before proceeding with testing, ensure battery voltage is 10.5-16.0 volts at idle.

Malfunction is detected when front HO2S heater circuit current is out of normal range. Possible causes are:

HO2S heater circuit open or shorted.
Defective HO2S heater.

To set DTC, turn ignition on. Select DATA MONITOR with scan tool. Start engine and let it idle for at least 6 seconds. If first trip DTC is detected, perform DIAGNOSTIC PROCEDURE .