OurPTGT - I think RallyDRock has a really good guess as to your O2 sensor code, particularly if you installed the DP. The location of the O2 sensor with the DP requires you to unclip the wires from the stock retainer clip in order to make a little slack so that they will reach the new location after the CAT in the DP. It could be that if you didn't make a new retention for the wires that they've rubbed or burned through.
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