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Home >> Subaru >> 2018 >> Outback 2.5i >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 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

Compare the diagnostic value with the threshold value, and if a condition meeting the malfunction criteria listed below continues for 10sx3time(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 = 1.33
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:  10sx3time(s)

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