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2004
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Impreza RS, Automatic
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Repair and Diagnosis
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Engine Performance
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Ignition System
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Ignition (H4SO)
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Spark Plug
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Removal
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Notes
Spark Plug: Removal: Notes
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.
Courtesy of SUBARU OF AMERICA, INC.