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  1. A/F Correction #1 -35% @ Idle (DTC P0171)

    Problems & Maintenance
    I have a completely stock 2012 2.5L MTX Outback with about 200k miles. I have had a P0171 code that shows up when idling for longer periods (more than 3 mins). I did recently replace the MAF, Front O2 sensor, and PCV since I am around 100k since last replaced and it was the first suggestions...
  2. Subaru Outback 2011 P0171 Can’t Solve

    Problems & Maintenance
    I have a Subaru Outback 2011 2.5 Limited which has been showing a P0171 Bank 1 System Too Lean code for weeks now. I have tried the following to fix it: replaced fuel pump with OEM Delphi pump/filter assembly; replaced the MAF; replaced both O2 sensors (before and after cat converter); replaced...
  3. 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...