It's a Mini Cooper base model, 2010, 28k ,Got CEL, then went to read the detail of the code, it's' thermostat temparature below regulating temp'. Searched online and determined to replace thermostat housing. got one from local dealership. Replaced by myself in ~4 hrs. Went to local auto parts store to reset the code. ~300 miles later, today, the CEL comes on with the same error code. Only concern is not able to pass emission test, then not able to register and drive again.
Any suggestions are welcome!