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I think the O2 sensors are supposed to be replaced at 60k. You'd need to check on that. I got the dreaded CE a year into ownership and it was oxygen sensor-related, so I replaced all four. I quickly discovered how much better the car performed, idled and gave 3+ MPG better fuel economy afterward.
Someone will have to tell you about the hunting idle issue you have. It would appear there are numerous sources and combinations that can cause this.
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