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2007 Forester Sports XT 4EAT
43,682 Posts
If you haven't replaced your front O2 sensor, that might be a good place to start. If the engine was running overly rich, I'd expect to see a P0420 CEL code, but perhaps it's not bad enough yet. :confused:

There are other possibilities:
  • Poor quality fuel.
  • Air filter needs changing.
  • Needs new spark plugs.
All guesses of course. :wink:


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