Will this plug directly into my existing wiring harness?

Yes. This is an OEM replacement, so it connects to factory harness points without modification. If your vehicle currently has a powered mirror, the connector is already there.

Do I need to reprogram the mirror after installation?

Memory function works out of the box on most units. If the mirror doesn't retain your position after a few adjustments, check your vehicle's settings menu or contact your dealer for a module reset.

Is the BSD sensor pre-calibrated?

The sensor arrives factory-calibrated. After installation, run a quick BSD system check through your infotainment menu to confirm detection zones are active. No field calibration needed.