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Where is the OBD port located in the Mercedes S-Class?

Model: Mercedes Classe S MK 3, W140 - Years 1991-1998
Part: Checks and maintenance

In this video, you can see where the OBD diagnostic port is located in the Mercedes S-Class W140, useful for example if you need to scan for errors recorded by the control unit. As shown, the port is not located under the dashboard like in most vehicles, but is instead positioned inside the engine compartment, specifically under the plastic cover located behind the right headlight. The layout of the port also differs from the current standard, which is why it is highly recommended to find the pinout diagram online.

Updated on 6 September 2026 by ScegliAuto

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