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#2: 09-30-2012, 05:30 PM
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Title: Senior Monkey
Location: Monticello, NY
Car: 04 Legacy NA (rip), 07 2.5i, 96 Outback
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Probably 0420.
More often than not it is the O2 sensor.
Bank one sensor 1 is up, sensor 2 is down.
Denso or Bosch.