Q: Check engine light is on. 04 Pathfinder. Quick check at Autozone and clerk said possible vacuum leak, o2 sensor, or catalytic conv

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The check engine light is on. Car runs very well but gets poor mileage. Autozone put a code check on it and said it was either a vacuum leak, an o2 sensor, or a catalytic conv. Your opinion?

My car has 11640 miles.
My car has an automatic transmission.

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