2000 nissan xterra code P0131

Question

I have a 2000 nissan xterra and the service engine light came on, I had it check

and service code po131 low fuel pressure and the other one po325 knck sensor the vechicle has 131,315 miles on it. how can I remedy this problem?

Answer 1

The code P0131 is for the front O2 sensor on bank 1. This is the passenger side of the truck and the O2 sensor before the converter.

P0325 is a knock sensor code. This code won't even turn the check engine light on. The sensor is located under the intake manifold and bolted to the engine block.

Changing the O2 sensor will normally resolve the 131 code.