Subaru LEGACY 2006 Manual page 182

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
6 CHECK EXHAUST SYSTEM.
Check exhaust system parts.
NOTE:
Check the following items.
• Loose installation of portions
• Damage (crack, hole etc.) of parts
• Looseness and improper fitting of parts be-
tween front oxygen (A/F) sensor and rear oxy-
gen sensor
Check
Is there any fault in exhaust
system?
EN(H4SO)(diag)-145
ENGINE (DIAGNOSTICS)
Yes No
Repair or replace Replace the rear
faulty parts. oxygen sensor.
<Ref. to
FU(H4SO)-34,
Rear Oxygen Sen-
sor.>