I have a 2006 Elantra GLS.  I recently took the car into the dealer
for a Engine Check light diagnosis (not caused by the gas cap!).  The
problem was Code P0172 - fuel system rich.  In following the diagnosis
tree, the tech removed the air cleaner cover, but did so without first
removing the shroud that goes around the air cleaner, and around the
battery.  He therefore scratched up the air cleaner housing rather
badly on the shroud flange that mounts to the top of the air cleaner
cover by trying to short-cut the removal.

The dealer was good enough to order a new air cleaner cover Part
number 28112D270, but interestingly, the replacement (same part
number) is not the same as the original!  If you look inside the
original cover there is an "air horn" of sorts projecting inside the
cover connected to the opening or hole of the cover which leads to the
intake.  The replacement does not have this air horn extension inside
the cover.

Anyone have any thoughts on this?  In looking at the Hyundai parts
website, it does not show this extension as available separately.  It
doesn't appear the air horn extension comes off easily either to place
it on the replacement air cleaner cover.

There must be a reason for this air horn extension inside the air
cleaner cover.  BTW . . .  the tech never found a problem that could
have triggered the fault code.

Thanks,
Don