Flatfour02 Posted May 31, 2018 Share Posted May 31, 2018 Hi all. So my 05 Outback XT is getting a P0171 code. It's been getting it for a while, but before, when I would reset it, it wouldn't come back right away. Sometimes it would take a few months before it came back. Well now it comes back after only a handful of miles. So the car has near brand new plugs and packs. Brand new denso MAF sensor, the O2 sensor is only about a year old, and I'm not finding any vacuum leaks. In case you're wondering, the MAF and O2 sensors were replaced in hopes of solving this problem. So it's idling a little rough, and my gas mileage is pretty bad. It seems to drive okay once it's warm, but when you first start the car and go to drive away, it hesitates. After that it never does in again. Any advice? So far it seems the only thing I can actually check is for vacuum/exhaust leaks, but anything else is just swapping out parts. Any help is really appreciated. Link to comment Share on other sites More sharing options...
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