2019 Subaru WRX STI Series.GrayFACTORY OEM SERVICE PROCEDURE

Drive Cycle F

DTC Item Condition Number of driving cycles on the detecting condition
P0111 INTAKE AIR TEMPERATURE SENSOR 1 CIRCUIT RANGE/PERFORMANCE BANK 1
  • 6 hours have elapsed since ignition switch is OFF under a completely warmed up condition.
  • For models with block heater, at least 6 hours must have elapsed without operating the block heater.
 2
  1. With the ignition switch ON (engine stopped), read the value in «Coolant Temp.» and «Intake Air Temperature». Refer to ENGINE (DIAGNOSTICS) (STI)>SUBARU SELECT MONITOR>OPERATION>DISPLAY CURRENT ENGINE DATA (NORMAL MODE) .
  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 gear shift lever from neutral position during idling.
  3. Drive according to the drive pattern described below.
    G13263809Courtesy of SUBARU OF AMERICA, INC.
    NOTE:
    • In pattern (2), it is acceptable to decelerate to less than 80 km/h (50 MPH) or to stop the vehicle depending on the traffic conditions. Drive the vehicle at 80 km/h (50 MPH) or more until the total driving time reaches or exceeds 15 minutes.
    • There is no given transition time between idling and cruising.
    • Driving at constant speed only on a downhill causes smaller engine load and may result in failure to obtain a right diagnostic result.
    • If the ignition switch is turned to OFF during driving cycle F, perform this driving cycle again after satisfying the conditions listed in the table.
  4. Read the temporary code using the Subaru Select Monitor or general scan tool. Refer to ENGINE (DIAGNOSTICS) (STI)>READ DIAGNOSTIC TROUBLE CODE (DTC)>OPERATION .
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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.