2001 xterra oxygen sensor location

SOURCE: check engine light

The knock sensor is screwed in the engine block below the intake manifold, and the O2 sensor (Oxygen sensor) is in the exhaust system. Most cars have more than one oxygen sensor. The knock sensor detects "knock" or fuel detonation in the engine, that is fuel that starts to burn without spark, and at the wrong time. Fuel knock can be harmful to an engine. From what I can see on the internet, knock sensors are a common replacement item on Nissans, not sure if people are replacing them because they commonly go bad, or replace them blindly, just by seeing the code. The O2 sensors in your exhaust are what indicates to your engine computer how well it's doing a job of injecting the correct amount of fuel at the right time and what adjustments it needs to do. Fault codes in electronic control systems need to be interpreted... Lots of people just see the codes and replace the sensors related to the codes. This might fix the problem sometimes, but lots of times the codes can be attributed to something else... You might change both the sensors and cure the problem, but you might dump money into replacing these parts for nothing and the problem could lie somewhere else (fuel pressure regulator, ignition components, etc...) Also it depends if these codes were "active" (still happening at the time of connecting it to the machine) or "passive" (happened at some point but not happening at the time of connecting it to the diagnostics machine). If they're active they are a lot easier to diagnose and fix than if they are inactive. I know for a fact, working in the field, inactive codes are often next to impossible to repair in decent time.

SOURCE: nissan xterra knock sensor

It's the valley of the engine underneath the intake manifold. It's about an $800 job because the top of the engine has to come off. However, unless you have a supercharged xterra it shouldn't effect performance. Also, the knock sensor will not trip the check engine light, as it does not indicate a primary problem, so if your light is on you should have another code that should be fixed first.

SOURCE: location of a o2 sensor 2001 nissan maxima

bank 1 refers to the side of the engine that #1 cylinder is on , and sensor 2 refers to downstream , after the catalytic converter. , this link shows bank 1 on a 2001 nissan maxima V6 being on the firewall side . if you had a 4 cylinder it would be downstream after the catalytic converter .

http://www.autozone.com/N,26200242/shopping/specsSelect.htm

SOURCE: 2000 nissan quest, service engine light on, idles rough...

sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

SOURCE: o2 sensors and knock sensor keep triggering check

After PCM code is erased, then after a week a code P0325 knock sensor cme up twice on your code reader. Knock sensor is crack needs replaced.