Was told the code was P1457 at AutoZone. What does it particularly mean
for a 99 Civic? Thanks.

You may already have looked at it, however here is a link about a
related discussion.

http://www.vtecpower.com/about1028.html

"Leak Detected In EVAP Control System"
http://autorepair.about.com/cs/troub.../l/bl_obd_main
..htm

An improperly tightened fuel tank cap is often the cause.
Remove, then install and tighten per the owner's manual
(three clicks?), and the code may go away. Check your
owner's manul for resetting the CEL.

<stonehenson (AT) gmail (DOT) com> wrote