2015 Subaru WRX STIFACTORY OEM SERVICE PROCEDURE

Drive Cycle F

DTC Item Condition
P0111 Intake Air Temperature Sensor Range/Performance Problem
  • At least 6 hours must have elapsed since the ignition switch was turned OFF under a completely warmed up condition.
  • For models with block heater, at least 6 hours must have elapsed without operating the block heater.

Diagnostic procedure: 

  1. With the ignition switch ON (engine stopped), read the value in «Coolant Temp.» and «Intake Air Temp.». <Ref. to DISPLAY CURRENT ENGINE DATA (NORMAL MODE) , OPERATION, Subaru Select Monitor.>
  2. If the values from step 1) satisfy the following conditions, idle the engine for two minutes or more.

    Condition: 

    Engine coolant temperature - Intake air temperature  ≤ 5°C (9°F) 

    NOTE:
    • If the conditions are not satisfied, turn the ignition switch to OFF and wait until the parameters are satisfied.
    • Do not move the shift lever from neutral position during idling.
  3. Drive according to the drive pattern described below.
    Fig 1: Driving Pattern (Drive Cycle F)
    G10265788Courtesy of SUBARU OF AMERICA, INC.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.