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Home >> Subaru >> 2019 >> WRX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (Except For STI) (1 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P014C: A/F/O2 Sensor Slow Response - Rich To Lean Bank 1 Sensor 1 >> Diagnostic Method 2

Diagnostic Method 2

Detect the malfunction by the cumulative value obtained from the amount of variation in λ change.

G08317431Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

Judgment value 

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value DTC
Cumulative value obtained from the amount of variation in λ change < Value from Map P014C and P014D
MAP SPECIFICATION

Cumulative value obtained from the amount of variation in λ 0 3
Cumulative value obtained from the amount of variation in λ change 0 2.5

Time needed for diagnosis: 

120 s (CVT model)

90 s (MT model)

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