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 the maximum and minimum voltage from the sensor are not reached to the specified voltages. Possible causes are:
- Defective HO2S1.
- Defective HO2S1 heater.
- Fuel pressure incorrect.
- Defective injectors.
- Intake air leaks.
NOTE:
Before proceeding, ensure ambient temperature is more than 14°F (-10°C) and battery voltage is more than 11 volts at idle.