There is one cat between the exhaust manifold and cat and one after the cat before the muffler they are easily identified as they are the only things with wires sticking out of your exhaust system but some models have the o2 sensor on the exhaust manifold.
The oxygen sensor on a 2004 Honda Accord is found on the exhaust system. They are placed close to the catalytic converter so the sensors can properly read the exhaust flow.
Depending on which sensor, IS it sensor 1 or 2
In the glove box
The 2004 Honda Pilot has a V6 engine.
The 2004 Honda Pilot has 24 valves.
Honda oxygen sensor is usually positioned in the exhaust manifold downpipe before the catalytic converter of your Honda vehicle or in the middle of the two mentioned components. For more details: http://sites.google.com/site/hondarepairsite/home/2004-honda-oxygen-sensor
The 2004 Honda Pilot is a gas-powered vehicle.
The 2004 Honda Pilot has a 5-speed automatic.
The 2004 Honda Pilot has a 28.5 degrees angle of approach.
The 2004 Honda Pilot has single overhead cam (SOHC).
The height of the 2004 Honda Pilot is 5 ft. 10.6 in. (70.6 in.).
The 2004 Honda Pilot has a 23 degrees angle of departure.