I just had the same thing today, and I had it before when I drove slowly for a while. The code should be cat efficiency below threshold. If u have the same code, cleared it with scanner and shift at high rev for a day. It's just a high flow down pipe related issue, not a faulty sensor.
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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
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