How to remove stock air filter box

Looks like Bank 2 sensor 1 fault. That would be the sensor directly under the air filter box. You have to remove the air filter box completely to see the top of it.

fiddly job
but easy to do
remembering what bolt and plug goes where
you will have to remove your petrol tank and air filter box
fuel tank has 3 bolts 1 at the bottom 2 at the top by the head stock
slowly remove the fuel tank remembering to turn off the stop tap
and remove the fuel pipe and the fuel gauge sensor wire

air filter box
under the air filter box
there are four banjo clamps
that hole the air intake tubes to the carburetors
undo these four screws and remove the air filter box

you will then see where your idle cable is located
just replace the idle adjust cable and reassemble the
air filter box and fuel tank in the reverse way you took it apart

Those two 10mm bolts and the two hose clamps (one on the throttle body and one under the "box") hold the upper air box in place. Remove this box and you will see the portion of the air cleaner that holds the air filter. You must remove another 10 mm bolt in order to lift the portion that contains the air filter out. Good luck Dano

http://www.wikihow.com/Change-the-Cabin-Air-Filter-in-a-Toyota

Remove seat, two bolts at rear...
unscrew wing bolt located in the middle of the air filter element
remove filter, and clean the mating area in the air box (WD-40 works well) Make sure not to get any dirt in here!!!
Remove the inner air filter cage, Clean the air filter (Stock ones are foam) I use kerosene or gas, but be careful, wash it then with soapy water and let it dry completely.
Use a foam filter oil, either spray on or in a bottle, and make sure it's covered completely, and tacky, not soaked. (I use Bel-Ray foam filter oil) Replace the air filter cage
Put a small bead of grease on the filter where it mates to the air box, this helps it seal.
Re-install air filter and seat, I use a little bit of lock-tite on the seat bolts, as they vibrate out.

on a 300zx lift the bonnet/hood.. inbetween the headlights (the panel with the zed emblem in the centre) underneath it is the standard airbox..to remove the panel there are 2 bolts holding it to the chassis.. undo these and the nose panel lifts out.. yo can know access the stock air box.. undo the clips on it and lift the top off to access the panel filters.. inspect/replace and do steps in reverse to put it all back together

Look for attachment bolts inside the air box under the filter at the bottom. ducts usually pull right out, just watch that you don't break or damage wiring etc.

first, remove the front black cover located next to the front grille. next, remove the black cover located on the left. the retainers can be removed by pushing down on pin located in the middle.
once these are removed, you'll see a black box. this contains the air filter. it can be opened by pushing the metal clips outwards. lift the cover and you'll find the filter. most stores don't stock these filters so you'll probably need to order it.

is the map sensor still there or did you remoe that too?

Yes there is a incabin filter in your air box just above the fan/blower motor. I have see mouse nests in there, clogging the filter. Remove glove box and get to the filter. Replace filter.