It could be a temporary issue. The code will still be available, even though the CEL has cleared itself. If you get an OBDII scanner you can read/clear it.
It could be a number of things, from bad gas to a failing O2 sensor, etc. Some codes could be harmless, some could actually mean something needs to get fixed in the near future.
The good(-ish) news, though, is that the car is clearing the CEL because this is not a consistent problem right now.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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