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  1. Problems & DIY Maintenance
    I have a 2004 Outback Legacy wagon with two fault codes creating a check engine light. The codes are P0400 (EGR A Flow) and P0031 (HO2S Heater Control Circuit Low (BANK 1 Sensor1)). I've been told to not worry about them -- the first time I took it in they cleared the codes for me and they came...
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