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I had a really similar experience! Driving home after having the clutch replaced, the CEL came on. It was a bad O2 sensor. I always wondered if it had taken a hard knock during the removal of the transaxle.
In most states, if they do the smog check by looking at the OBD, you'll fail if a code has been recently reset. You have to drive the car a certain number if cycles and miles before the OBD will check out good.
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