F20/F21
Key reference: 66129287072
Diagnostic port location (OBD)
Illustrative — for orientation only.
LHD: driver's footwell, high up under the dash on the door side, just outboard of the steering column above the pedals, behind a small clip-off plastic cover. RHD (UK): mirror image — driver's footwell on the right, door side, behind the same clip-off cover near the bonnet-release lever. Same position across all F20 (5-door) and F21 (3-door) trims.
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