I had been looking for the same answer for a 2007 Pilot and couldn't find it. So i bought the filter and took a shot myself. . .
Upon opening the hood, my 7-year old son could figure out where the engine air filter goes. It's a black box on the driver's side with a very wide hose going out of it to the engine. If you bought the right size replacement air filter, that's the shape of the black box.
You're going to need some light because there are four screws holding the cover of the filter box on. Unscrew them. Gently lift off the cover (so as not to disconnect the filtered air hose to the engine). Remove and discard the old filter. Put in the new filter. Replace the cover and tighten the screws.
Congratulations. You just saved yourself some money by installing it yourself. Now go wash your hands. . .
Side Note: Best to use a socket wrench w/ an extension to reach the 2 back screws (1 definitely will benefit from a flood light too).
HONDA PILOT .ORG - Changing out the cabin (dust/pollen) filter HONDA PILOT .ORG - Changing out the cabin (dust/pollen) filter
Auto Transmission Fluid
4.5 qts. with filter change, 4.2 qts. without filter change.
The typical change interval is every 12000 miles. I change the air filter and cabin filter at the same time.
B = Change engine oil/filter 1 = Rotate Tires 6 = Replace rear differential fluid (if equipped)
under the motor by right front tire
See Honda Pilot dot org. http://www.hondapilot.org/forums/showthread/t-20409.html
There is no automatic transmission filter on Honda Pilot.
The 2007 Honda Pilot has a V6 engine.
The 2003 Honda Pilot has a V6 engine.
The 2008 Honda Pilot has a V6 engine.
The 2004 Honda Pilot has a V6 engine.