I was looking under my car's hood when I saw this box next to and above the car battery:

Box with 16 numbered holes

The car is a 1995 Mercedes E 300 Diesel, and I noticed that there are are also 16 numbered (and 4 lettered) fuses in the fusebox. Does anyone know what this box does? My first guess (just based on location) is that it's somehow related to the electrical system.

1 Answer 1


That is your diagnostic connector. You will need a Mercedes-specific tool to read trouble codes stored by the computer.

Trouble code connector

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