I recently bought a maxima and the previous owner had the ghetto cone intake setup as shown here:

http://www.brianv.net/mods/filter/

I have since removed the cone, put in a K&N panel filter and hacked the airbox/resonator. While doing this I noticed a sensor was missing from the upper part of the box, what is the sensor for? I found it dangling in the engine bay and havn't put it back on yet, but I'm wondering if it is messing up my gas mileage.

 

I wouldn't worry too much about it. Mine's been dangling for 2 years now.

 

y let it danlgle? i just slid it thru into the inside of the filter and tightened the brackets holding the filter to the maf adapter so just the wire were going thru, its stays put and it does its job....very easy to do....