2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE

Engine Control Module (ECM): Installation

Install in the reverse order of removal.

CAUTION: When the ECM of model with immobilizer has been replaced, be sure to perform the registration of immobilizer system.
  • For model without keyless access with push button start, refer to the Type B in "REGISTRATION SERVICE INFORMATION FOR IMMOBILIZER".
  • For model with keyless access with push button start, refer to the Type D in "REGISTRATION SERVICE INFORMATION FOR IMMOBILIZER".
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

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

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

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