Just a though, borrow a obd reader, check how many km has it done since the last check engine light(if any) was clear. If its recent, there might be sth wrong.

using the Perth-WRX mobile app

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport