One problem related to crankcase (pcv) has been reported for the 2017 Honda Civic. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2017 Honda Civic based on all problems reported for the 2017 Civic.
Engine oil dilution. There is an issue with the l15 engines and gas flowing down past the pistons into the crankcase. These engines have been recalled in china and only "affected" states in the us and canada. I do not live in one of these "affected" states but my engine oil level is above the maximum level and smells heavily of gas.