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Home >> Subaru >> 2017 >> Legacy 3.6R Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Control System (Diagnostics) (P0171 To P0685) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0172: System Too Rich Bank 1 >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Compare the diagnostic value with the threshold value, and if a condition meeting the malfunction criteria listed below continues for 10 s x 3 time(s) or more, judge that there is a fault in the fuel system.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Offset amount of main feedback compensation < Value from Map

Map 

Warm-up increase compensation coefficient 0.000 0.102 0.199 0.301
Threshold Value 0.67 - 0.000 0.67 - 0.102 0.67 - 0.175 0.67 - 0.237
Warm-up increase compensation coefficient 0.398 0.465
Threshold Value 0.67 - 0.289 0.67 - 0.319

Time needed for diagnosis:  10 s x 3 time(s)

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.