Possible Causes - DTC P0031 (Bank 1) Or DTC P0051 (Bank 2)
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 an excessively low voltage is sent to ECM through HO2S1 heater. Possible causes are:
- HO2S1 heater circuit open or shorted.
- Defective HO2S1.