LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2018 >> WRX STI >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (1 Of 4) (STI) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control >> Diagnostic Method
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Method

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Engine coolant temperature < -15°C (5°F)
Elapsed time after starting the engine
((Smaller value either one of engine coolant temperature and intake air temperature at engine start) =-23.3°C (-9.9°F))
or
≥ 120000ms
((Smaller value either one of engine coolant temperature and intake air temperature at engine start) < -23.3°C (-9.9°F)) ≥ 300000ms

Time needed for diagnosis:  120 or 300 seconds

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