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 either bank 1 or bank 2 does not operate in closed loop. Possible causes are:
- HO2S1 circuit open or shorted.
- Defective HO2S1.
- Defective front HO2S1 heater.