Trim Packages, Head-Up Display, and Windshield Variants
Selecting the correct replacement glass for this vehicle comes down to distinguishing between the Premium, Plus, and Prestige trims. Base setups use green heat-insulating glass without optical hardware, corresponding to dealer reference 4M0-845-099 NVB. Plus models typically introduce Audi Pre Sense Front and Active Lane Assist, which require windshield variant 4M0-845-099-A featuring an integrated forward-facing multifunction camera bracket and an acoustic interlayer to silence cabin noise. When you move to the Prestige trim, the vehicle incorporates a factory Head-Up Display (HUD). This system demands glass equivalent to 4M0-845-099-B (and updates such as 4M0-845-099-BC), which contains a specialized wedge-shaped polyvinyl butyral (PVB) interlayer.
If an ordinary acoustic windshield without that wedge profile is set into a HUD-equipped vehicle, the projected instrument cluster graphics will double, creating a nauseating secondary reflection on the inner surface. When someone books a replacement with me, I am usually at their driveway roughly an hour later, double-checking the glass stamp and interior headliner brackets before doing any tear-down. Even though this platform shares underpinnings across the Volkswagen Group MLB-evo family—including the Porsche Cayenne and VW Touareg—the glass cut, rake angle, and lower cowl anchor points are exclusive to this body and cannot be interchanged with other group models.
Cowl Mechanics, Hardware Brackets, and Recall Hazards
Underneath the exterior glass edge sits a two-piece plastic cowl screen that clips into a dedicated retention channel glued directly to the bottom underside of the glass. Clearing this section requires pulling the dual pantograph wiper arms, which seize onto their splined tapered posts and require a specialized mechanical puller to detach without cracking the cowl plastic. Up top, the glass sits flush against either the painted steel roof structure or the front edge of the panoramic sunroof header cassette, while the sides meet painted exterior A-pillar moldings that conceal the glass edge.
The interior mirror bracket houses a combined rain, light, and humidity sensor that relies on a fresh optical gel pack to read windshield saturation correctly. Certain 2020 production models were subject to Transport Canada recall 2023-162 (Audi recall campaign 90TV), where the camera defogger heating element on the glass surface could overheat and smolder. When replacing glass on these mid-cycle refreshes, the camera housing and heater element wiring harness must be inspected for thermal discoloration before connecting to the new windshield bracket.
Post-Replacement Inspection Checklist for Owners
- Head-Up Display Clarity: Switch on the HUD from the MMI controls and confirm that speed and navigation figures show sharp, single-edge fonts without a ghosted secondary image offset above the primary projection.
- Cowl Seat and Wiper Sweeps: Verify that the two-piece plastic cowl screen is snapped flush into its lower glass channel across the entire base, leaving no vertical gap where wash water can bypass directly into the cabin air intake.
- A-Pillar Moulding Alignment: Inspect the exterior painted A-pillar mouldings to ensure the rubber sealing lips lie completely flat against the outer glass borders without lifting at highway speeds.
- Rain Sensor Function: Spray water directly over the center rearview mirror mount from the outside to ensure the wiper motor cycles automatically and adjusts its wipe frequency based on moisture density.
- VIN Notch Window: Look through the bottom driver-side corner of the windshield to verify that the VIN plate on the dash sits squared inside the clear glass window cutout.
