Yes..last of the 124 chassis had that feature..anything with Cal emmissions and CE lamp had that until they went with OBD2. That requires a digital scanner.
The rule of thumb is ...If you have a CE lamp on OBD1, you have a code stored and that code would effect emmissions standards.
The other sockets are more specific faults for the other system modules.
All93/95 had Cal emmisions standards, so they all have the led/sw. with analog Flash retrieve.
E320 16 PIN DTC Charts inc. pin 8, pin 14