On top behind the filter hose next to the fire wall on the right side of the engine when facing the front of your SUV. There is two of them that looks a lot a like the first one you see is the egr valve the other one is egr-bt.
Check your EGR valve
behind the rear tire on the drivers side under the mud flap
10w-30
Your auto parts dealer can give you this information when you purchase your spark plugs. But a 1998 Infiniti QX4 gap is .041.
where is the IAT sensor located on 99 qx4 infiniti
disconnect lines and hoses and remove fasteners
How many quarts in an infiniti qx4 97
Should be same as QX4 99, 15/city, 19-20 /highway (assuming engine in tip top condition)
Oil filter in an Infinity QX4 1997 is found underneath the engine. The plastic cover that hides the whole engine from below should be removed and there the filter can be seen.
after making repairs, use the consult-II to verify fix and light will go out.
look for it around the egr valve & throttle body. based on the diagram i got, it is mounted on the intake manifold (top of engine; driver side). good luck!
were is the thermostat located