4S1

The first three characters of every VIN are the World Manufacturer Identifier (WMI). The code 4S1 is assigned to Isuzu, with the country of manufacture United States.

So any 17-character VIN that begins with 4S1 was produced by Isuzu:

4S1ZZZ0000000000000

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.