2000 Si Civic - PO452 question

My girls Civic failed an OBD2 emissions test today with a stored PO452. For
those of you familiar with these Hondas I was wondering if this is a common
deal (I rarely see pressure sensor problems on Toyotas), or if I actually
(sigh) have to diagnose the circuit. By the way, I haven't looked at the
car myself yet.

 

http://autorepair.about.com/library/faqs/bl216h.htm

most likely caused by not tightening the cap properly, driving without
the cap, a failed cap, or a cap that doesnt fit right.

id make sure the cap is OEM honda and correct, then reset the code. if
it happens again, id check the circuit. its not a common problem on
hondas, either.

 

Also once you reset the computer all the drive cycle tests are reset and it
could take several days and drive cycles for them to complete. So don't run
to the test center right after resetting the computer or it will fail
because the tests aren't complete...