First, remove battery negative cable.Then I would remove kick panel (by right foot when sitting) on passenger side & locate BCM (body control module) . remove the harness connector to it & spray well with contact cleaner in connector & on module where they meet. Let it dry a bit, then re-connect it & re-connect negative battery terminal, and see if that helps. It's not unusual for these codes to come up & make one think that a part needs to be replaced, when it's just a bad connection.
P0134= Right Rear (or just) Upstream O2S Stays at Center
Discription=Neither rich or lean condition detected from the oxygen sensor.
P0401 =EGR System Failure
Discription= Required change in air/fuel ratio not detected during diagnostic test.
hope this helps
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