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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Control System (Diagnostics) (P0171 To P0685) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0171 System Too Lean 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 continues for 10s x 3time(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 SPECIFICATION

Amount of air g/s (oz/s) 0 (0) 3.2 (0.11) 6.4 (0.23) 9.6 (0.34) 12.8 (0.45) 16 (0.56) 19.2 (0.68)
Threshold Value 1.33 1.33 1.33 1.33 1.33 1.33 1.33

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

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.