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I forgot to mention that I checked under the passenger-side footwell carpet and have the old 37800-PHM-345 ECM that is subject to Honda’s Service Bulletin 07-038 which condemns the 345 as a “failed part” for misinterpreting sensor inputs and resulting in a false catalytic deterioration diagnosis. The bulletin’s fix is replacement with 37800-PHM-355, so I scored one on eBay. My mechanic did in fact pull an P0420 “catalyst system efficiency below threshold”, so I’m hoping beyond hope that replacing the 345 the 355 will prove that particular DTC false.
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