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Where to Find the OBD Port on a Mercedes S-Class W140

Model: Mercedes Classe S MK 3, W140 - Years 1991-1998

In this mini guide for all you owners of a Mercedes S-Class W140 (1991-1998), we will discover where the OBD port is located, allowing you to easily connect any professional diagnostic tools. First, go inside the cabin and reach the driver's seat. Then, shift your attention to the lower area of the dashboard and locate the OBD port on the left side. Once found, you can connect the diagnostic tool to check for any electronic issues.

Updated on 10 July 2026 by ScegliAuto

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