I have the 2.0.
I took it in today to a shop to get the oil changed and they said the service engine light was on so they checked it out. They told me it was the engine coolant thermostat that is why I am planning on changing it out.
The code was P2181.
That is correct then, that code is faulty thermostat 99% of the time. The only other thing I would advise is to check the color of the temp sensor in the coolant flange on the side of the head. If it's black or green with a yellow dot they are known as having an extremely high failure rate and I'd think about replacing it just to prevent any future problems. The green without a yellow dot one almost never fails so it's just preventative action.
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