What is your question?
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What is your question?
I have reset the codes, they both come back on within 30 miles, I put a new oxygen sensor on the upstream one with no change
What makes this problem better or worse?
No change on all the time
How long has your 2010 Hyundai Sonata had this problem?
Code been on for awhile, My Father hasn't driven car much in last few months but will be driving alot now
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