Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. 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:
Before proceeding, ensure battery voltage is more than 11 volts at idle.