Installing the front wheel arch trim on the door sill (partially removed)

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Check the clips (2) and sealing ring for damage and, if necessary, replace them.
The sealing ring must not be damaged or missing.
Check the detents for damage; if necessary, replace the wheel arch trim (1) .
Position the wheel arch trim (1) and engage at the clips (2) .
Engage the wheel arch trim (1) at the detents along the dotted line.

Courtesy of BMW OF NORTH AMERICA, INC.