Subaru LEGACY 2006 Manual page 258

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
9 CHECK FUEL TANK.
Remove the fuel tank. <Ref. to FU(H4SO)-41,
Fuel Tank.>
10 CHECK ANY OTHER MECHANICAL TROU-
BLE IN EVAPORATIVE EMISSION CON-
TROL SYSTEM.
Check
Is the fuel tank damaged?
Are there holes of more than
0.5 mm (0.020 in) dia., cracks,
clogging or disconnections of
hoses or pipes in evaporative
emission control system?
EN(H4SO)(diag)-221
ENGINE (DIAGNOSTICS)
Yes No
Repair or replace Go to step 10.
the fuel tank. <Ref.
to FU(H4SO)-41,
Fuel Tank.>
Repair or replace Contact the SOA
the hoses or pipes. service center.