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  1. P0171 on 2009 Outback 2.5XT only with Ethanol Gas

    Gen 3: 2005-2009
    Hi All, I've been cruising these forums and others a good bit for a solution to my intermittent P0171 problem. This has been going on for abut 2 years intermittently, and occurred both before and after an engine swap (performed by dealer, no mods). The CEL used to come on after an hour or more...