09-12 Audi B8 A4 A5 Q5 Headlight Fog Light Dim Switch Control OEM

Fitment and Compatibility

This is the headlight fog light dim switch control module for the Audi B8-generation A4/A5/Q5, covering the 2009 to 2012 production years across these related platforms, which share electrical architecture from this era. Confirm your specific model and year falls within this window before ordering, since Audi’s switch gear design changed with later B8.5 facelifts.

Part Overview

This small control module handles the dimmer function for your fog lights and instrument cluster brightness, a common wear item on cars of this age since the internal potentiometer and switch contacts see heavy daily use. It’s a frequently-replaced part on used B8-era Audis, not because it’s poorly made, but because a decade-plus of daily use wears out the internal contacts.

Condition and What’s Included

Tested for function across the dimmer range and switch positions before listing, confirming smooth operation without the sticking or intermittent dimming that’s the usual symptom of a failing original unit.

Installation Notes

This is one of the simpler electrical swaps on the B8 platform — typically accessible from the dash trim near the headlight switch, unclip the factory harness, and press the replacement into place. No coding or programming required since this is a passive switch module, not a networked control unit.

OEM vs Aftermarket

Switch gear feel and durability is one area where genuine OEM parts noticeably outperform generic replacements — the tactile feedback and long-term reliability of a factory switch is hard to replicate in aftermarket alternatives.

Shipping and Support

Ships in protective packaging appropriate for a small electrical component. If you’re not sure whether your symptom matches a failing dimmer switch versus a different electrical fault, describe what you’re seeing and we can help narrow it down before you order.

Warranty and Returns

30-day return window and a 30 to 90 day functional warranty on the dimmer switch operation across its full range. If you’re not sure your symptom matches this part’s function, ask us before ordering — that’s the fastest way to avoid an unnecessary return.

Why Buy This From Us

Small electrical parts like this are easy to sell untested, and we specifically check the dimmer range and switch feel before listing rather than assuming it works because it looks intact.