Hello Brian.Hi X-TRAILERS, As a newcomer, and having just bought a 2007/8 GX 2.5 petrol version here in Brazil, I'm not sure about the sensors you've been threading about. What I do know is that, soon after acquisition, the engine warning light came on, and, after a few kilometres, cut out. Luckily, I could restart and make it home. My competent mechanic, 2nd generation of a Japanese immigrant family, flashed his "videogame", his electronic test equipment. It showed a rev (rpm) sensor hidden at the back of the engine needed replacement. VERY EXPENSIVE ! Next day, I noticed that the idle would keep rising and falling between 1,500 and 2,000 rpm. Strangely, upon turning on the airconditioner (AC), the idle would fall to 800 or so, i.e the normal revs when the AC is off. Well, my Jap wizard used his electronic device again, and with a little reconfiguration, consisting of turning the ignition on and off at certain intervals, managed to fix the problem. It also goes to show that you don't need to pay an even more expensive arm and a leg at an authorised Nissan dealership. Good X-ing. BRIAN
Six years later: I just ordered a Bosch Oxygen sensor from Rock Auto. After exchange and shipping: under $50 Cdn. The Amazon link is now $70, with free shipping — in 2021.Hi FarmerChef
Upstream NTK 24298
Downstream NTK 24407
From Rock auto right now a bit under 100 for both plus delivery. I bought mine off Amazon a bit over a year ago.
Here is a link for one ( Ignore Amazon not thinking its the right one)
NTK 24298 NGK/NTK Packaging Oxygen Sensor, Oxygen - Amazon Canada
Its a good deal. Cheaper than Rock Auto and free shipping. Just checked for the downstream and Rock Auto has best price at just shy of $44.
Both of these are identical to the original parts used by Nissan. Good luck changing them out.