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Home >> Subaru >> 2017 >> Impreza Base, 4D Sedan, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostics) (P000A To P015B) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P013F: O2 Sensor Delayed Response Lean To Rich Bank 1 Sensor 2 >> Diagnostic Method

Diagnostic Method

Detect the trouble by calculating the time from the completion of the fuel cut to the beginning of the rear oxygen sensor voltage starting to rise.

Fig 1: Rear Oxygen Sensor Response Time Graph
G11257359Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE DESCRIPTION

Malfunction Criteria Threshold Value
Output voltage value of rear oxygen sensor Less than 0.2V
MAP SPECIFICATION

Amount of intake air g/s (oz/s) 10 (0.35) 12 (0.42) 14 (0.49) 18 (0.63) 22 (0.78) 24 (0.85)
Elapsed time (s) 7.5 6.5 5.5 4.0 2.6 2.0

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