The Subaru Denso DST-i interface and software is the OEM diagnostic solution for all 2004 and newer Subaru vehicles. This is the same tool the Subaru dealerships use. The DST-i can be used in combination with Subaru Select Monitor III software (SSMIII) for all 2004 to 2015 vehicles. On 2016 and newer vehicles the DST-i must be used with Subaru Select Monitor 4 software (SSM4).