P0031 2003 Nissan Altima where is the fuse located that causes this error code to come up?

Question

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

now i can't locate the fuse this is referring to

Answer 1

Hi there,

This gets power from fuse #15 in the fuse box inside the car, it's a 15 amp fuse. If the fuses are all good then I would replace the sensor which is a very common issue on these.