X156 (GLA I)
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Diagnostic port location (OBD)
Driver's side footwell, under the lower dashboard trim. Behind a small removable plastic dust cover. Port faces downward and is accessible without tools once the cover is opened. Located above the pedals, to the left of the steering column. Consistent with the W176 A-Class sibling — the X156 GLA shares the same body architecture and OBD port placement.
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