This can be useful to vehicle owners, used car buyers and repair professionals. This Index report summary also provides insight on the most common repairs for the top 10 vehicles in each category. 10 vehicles by year, make and model with the fewest repair incidents/lowest average repair costs.10 brands with the lowest repair incidents/lowest average car repair costs.In this report you will find the following: The 2018 CarMD® Vehicle Health Index TM Make and Model Reliability Rankings studies and ranks in-use vehicles and brands based on frequency of check engine light (CEL) problems and then separately on average cost of repairs.