DYI steps please - 97 Pathfinder Oxygen Sensor and Throtle Position Sensor

underling said:

o2 sensor (depending on which one you are replacing) will be right on the exhaust pre and post cat. go to your local auto tool supplier and buy an o2 sensor socket. i changed the 2 rears in my '98 in about 1/2 hour from start to finish. Fronts look a little trickier but still doable. just need a couple extensions. Also to break the one side free on the rear o2's I used a 12" breaker bar on my ratchet. and just gentle steady pressure broke it free.

How do you know your TPS is bad? error code?

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If I may add, use WD-40 or equivalent on the O2 sensors before and during the removal process. It should help if you let the lubricant set in a little before actual removal.

I don't know if the spark plugs have a cover on them attached to the cable. But, before removing the spark plugs, get a screwdriver and loosen up the sand and crap trapped at the base of the spark plugs, then blow it out with compressed air or canned air, one at a time. Last thing you need is crap getting into the combustion chamber. Did it on my 95 Pathfinder and glad I did, lots of sand.