Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected when the voltage from HO2S1 is constantly about .3 volt. Possible causes are:
- HO2S1 signal circuit open or shorted.
- Defective HO2S1.
NOTE:
Before proceeding, ensure battery voltage is more than 11 volts at idle.