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Section 154 (Ignition (H4SO))
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Spark Plug
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Removal
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Notes
Spark Plug: Removal: Notes
WARNING:
This page is about a different car, the 2004 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
All spark plugs installed on an engine, must be of the same heat range.
Fig 1: Identifying Spark Plug Chart
Courtesy of SUBARU OF AMERICA, INC.