Subaru 2003 Impreza - Manual (Page 346)

IMPREZA(NA) A1850BE-A (ENGLISH)
11
Maintenance and service
11-23
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4. To install the air cleaner case cover, insert the two
projections on the air cleaner case cover into the
slits on the air cleaner case and then snap the two
clamps on the air cleaner case cover.
Spark plugs
It may be difficult to replace the spark plugs. It is
recommended that you have the spark plugs re-
placed by your SUBARU dealer.
The spark plugs should be replaced according to
the maintenance schedule in the “Warranty and
Maintenance Booklet”.