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2000 impeza outback sport codes P0301,P0302 did complete tune up still codes after 5 min.warmup


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Unplug and pull out the pre-cat O2 sensor, see if it makes a difference. Or, if your flange is before the cat, you can do it there too. Make sure to unplug both o2 sensors when doing this test. It will help see if you have a plugged exhaust.

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