Subaru LEGACY 2006 Manual page 829

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Symptoms
10. Excessive fuel consump-
tion
Engine Trouble in General
Problem parts etc.
Engine control system <Ref. to EN(H4SO)(diag)-2, Basic Diagnostic Procedure.>
Intake system Dirty air cleaner element
Belt Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective gasket
Improper valve sealing
Defective valve stem
Worn or broken valve spring
Worn or stuck piston rings, cylinder and piston
Incorrect valve timing
Lubrication system Incorrect oil pressure
Cooling system Over-cooling
ME(H4SO)-93
MECHANICAL
Possible cause RANK
A
A
B
B
C
C
B
C
C
B
B
C
C