Subaru Legacy 2003 Service Manual page 844

The CHECK ENGINE malfunction indicator lamp (MIL) flashes the code corresponding to the faulty parts.
The long segment (1.3 seconds ON) indicates a "ten", and the short segment (0.2 seconds ON) signifies
"one". And middle segment (0.5 seconds ON) means OK code.
NOTE:
• For detailed concerning diagnostic trouble codes, refer to the List of Diagnostic Trouble Code (DTC). <Ref.
to EN(H4SOw/oOBD)-57, LIST, List of Diagnostic Trouble Code (DTC).>
OK code
0.5
Trouble
code 13
Trouble
code 21
READ DIAGNOSTIC TROUBLE CODE (DTC)
0.5 0.5 0.5 0.5 0.5
1.3 0.2 0.2 0.2 0.2 0.2 0.2
1.3 0.2 1.3 0.2 0.2
EN(H4SOw/oOBD)-25
0.5 0.5 0.5
1.8 1.3 0.2 0.2
1.8 1.3 0.2 1.3
ENGINE (DIAGNOSTICS)
0.2 0.2 0.2 0.2
Unit: second
0.2 0.2
EN-01039