Subaru LEGACY 2006 Manual page 125

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
6 CHECK REAR OXYGEN SENSOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between rear oxy-
gen (A/F) sensor connector terminals.
Terminals
No. 1 — No. 2:
Check
Is the resistance less than 30
Ω?
EN(H4SO)(diag)-88
Yes No
Repair the har- Replace the rear
ness and connec- oxygen sensor.
tor. <Ref. to
FU(H4SO)-34,
NOTE:
Rear Oxygen Sen-
In this case, repair
sor.>
the following item:
• Open circuit of
harness between
rear oxygen sen-
sor and ECM con-
nector
• Poor contact of
the rear oxygen
sensor connector
• Poor contact in
ECM connector
• Poor contact of
coupling connector