There are a couple YouTube videos that may help w/replacement. They helped for me. http://www.mynissanleaf.com/viewtopic.php?p=478564#p478564 was my commentary along with another a few posts later.
It depends upon the year or model because the filter cap on my 2015 SL is different than the one on my 2011 SL was. It is much easier to release the clip on the newer version.
