II (X250/X290)
Key reference: 71738117
Verified · record updated 16 Oct 2026
Key variant · 1 of 2
Key
Compatible tools
ConfirmedOBD port
Illustration — use it to know where to look.
Lower dashboard, to the left of the steering column, behind a small rectangular cover panel (approximately 14 x 8 cm) secured by two cross-head screws. The 16-pin OBD-II connector sits at the back of the recess, roughly in line with the driver's left knee. Same location on all Relay II body variants (Panel Van, Chassis Cab, Minibus).
Remove the rectangular cover panel by unscrewing two cross-head screws — a standard Phillips screwdriver is sufficient. Pull the panel away to expose the 16-pin connector recessed at the back of the cavity.
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