Installed new primary oxygen sensors, both sides,
DENSO 2340135 and
OEM Nissan crankshaft position sensor 23731-EA20D,
since they're right next to each other.
The driver's side, now that was real fun, the connector absolutely refused to release, ended up accidentally pulling the harness-side end off the little bracket that held it in place, then removed the O2 sensor and fished it up past the exhaust manifold til I could reach it from the top of the engine bay, squeezed the electrical connector with a needle-nose pliers and finally got it to separate. Whew. Grrrrr, running gun battle.
The crank position sensor is easiest removed, by pulling the hold-down bolt first, after sliding back the water shield boot, then pulling the sensor toward you and popping the connector off. Plug the new sensor back onto the harness then fish it back around the coolant transfer pipes in the area and get it back in it's hole. I used a 10mm Proto magnetized socket to prevent dropping that little booger ( the holddown bolt ) , it'd be easy to do, you might not find it afterwards, and it's a weird bolt with a shoulder, so you're not going to get one at Lowes or Home Depot. Buttoned everything up after reinstalling both inner fender liners and drove the truck about 20 miles, no codes, no flashing lights. Victory.
Interestingly, the new sensors have a metal shield over the business end of the sensor, which to me is pretty weird, cause I thought they were magnetic sensing and shouldn't a metal cover interfere or weaken that signal, but that's what they're doing now and it works just fine. Go figure.

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