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Where is the EOBD Port on the Citroen C4?

Model: Citroen C4 MK 3 - Years: 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Checks and maintenance

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Video tutorial

Every vehicle has a diagnostic port (European On-Board Diagnostics) that connects to the main control unit to read any errors that have been logged as they occur. This port is used by workshop technicians to diagnose various issues, and by DIY enthusiasts, who can use a suitable reader to see what problems our beloved vehicle has. Typically, vehicles have this socket on the left side of the steering wheel, at the bottom, and it is clearly visible.

However, Citroen has hidden the C4's socket behind a panel in the centre console. Under the air conditioning buttons, insert a flathead screwdriver and pry it open.

A small compartment will open, revealing the socket, in bright green, right there in front.


Updated on 22 August 2026 by ScegliAuto


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