Then I plugged the diagonist tool in and erased the codes. The check engine light went off for a second then back on. I plugged the diagonist tool in again and when I clicked on read codes it showed up as the p0342 code. I went down a little farther on the tool and it has an o2 sensor read and i clicked that and it came up as O2 Bank1 Sensor fault. More @Wikipedia
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