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Home >> Subaru >> 2017 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (P0171 To P0685) (2.5L) >> 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 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 SPECIFICATION

Amount of air (g/s (oz/s)) 0 (0) 2.34375 (0.08) 4.6875 (0.17) 7.03125 (0.25) 9.375 (0.33) 11.71875 (0.41) 14.0625 (0.5)
Threshold Value 1.35 1.35 1.35 1.35 1.35 1.35 1.35

Time Needed for Diagnosis:  10 s x 3 time(s)

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.