4S

The first three characters of every VIN are the World Manufacturer Identifier (WMI). The code 4S is assigned to Subaru-Isuzu Automotive, with the country of manufacture United States.

So any 17-character VIN that begins with 4S was produced by Subaru-Isuzu Automotive:

4SZZZ0000000000000

The WMI only identifies the maker. To read the year, engine, plant and serial number, decode the complete 17-digit VIN with our free tool — then check which ECU it uses and what tuning services (DPF, EGR, AdBlue, DTC off, Stage) are available.