Subaru IMPREZA GD 2007 Series Manual page 2501

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MECHANICAL
Symptoms
10. Excessive fuel consumption Engine control system <Ref. to EN(H4DOTC)(diag)-2, Basic Diagnostic Procedure.>
Engine Trouble in General
Problem parts etc.
<Ref. to EN(STI)(diag)-2, Basic Diagnostic Procedure.>
Intake system Dirty air cleaner element
Timing belt Defective timing
Compression Incorrect valve clearance
Loosened spark plug or defective gasket
Loosened cylinder head bolt or defective head 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(H4DOTC)-100
Possible cause RANK
A
A
B
B
C
C
B
C
C
B
B
C
C