07 Nissan Frontier codes

[Russell]

JP's truck's check engine light is on. It currently has P0420, and has some times shows P0463.


I am not as worried about the P0463 most said it was the tank sending unit.

Been using my Google fue best I can tell the P0420 is either the catalytic converter or oxygen sensor. Seems like most people said they needed to replace the converter.

I am assuming it would be the down stream O2 sensor?

Is there anyway to test the oxygen sensor?

[Beagle]

Sounds plausible, I'd go with that ... and I'd try to take the rearward o2 sensor out and break it when I did, so then I'd go ahead and replace it. Right before I ordered a cat for it. That's the way things roll for me. Rockauto loves me.

There was a write up on itstillruns.com for o2 sensor testing, but I think just planning on replacing it might not be a real bad idea. How many miles?

[anotheridiot]

This is a way to test them

https://itstillruns.com/test-sensor-5193043.html

Just remember, the reason you get a code is that there is no temp change from the before converter to after converter. So it does make sense to check, although 10 years if 1 went, both are probably close.

I just did a simple 19.99 laser thermometer test to verify the converter by checking temperatures, I mean if you are down there and the converter is glowing, its bad.otherwise its just a little slow which should show you a bigger temperature difference between front and back.

[Russell]

It's got 170k+ miles. I read the test I am not sure which wire is which, there are 4 wires black, gray, and 2 whites. If it's dead I can see how that would work but the down stream O2 sensor should not change as much if the cat is doing its job, right?

[anotheridiot]

I talked to a guy at a manufacturer, pretty sure he said one white and the gray were the heater. Its a 12 volt heater that gets the temperature up before the exhaust can heat it enough to read. so the other two are a signal and a ground. one wire sensors just have a black wire.