2019-2023 Audi Q8 Fender Splash Shield: Noise, Damage, and Replacement Guide

Symptoms of a Failing Fender Splash Shield

Failures of the fender splash shield are almost always due to physical damage from hitting curbs, large potholes, road debris, or ice buildup in winter. The symptoms are typically easy to hear and see.

• Scraping or Rubbing Noises: This is the most common symptom. A loose or torn section of the liner makes contact with the tire, creating a scraping sound, especially when turning or going over bumps.
• Flapping Sounds at Highway Speeds: If a piece of the liner breaks away from its mounting points, it will flap loudly in the wind, creating a distracting noise.
• Visible Damage or Sagging: You may be able to see that the liner is cracked, has holes in it, or is hanging down and out of position. In some cases, it may be missing entirely.
• Excessive Debris in Engine Bay: If you notice an unusual amount of dirt, leaves, or grime under the hood, it could be a sign that the liner is compromised and no longer sealing the wheel well properly.

Known Issues, TSBs, and Recalls

As of mid-2026, there are no specific recalls or widespread Technical Service Bulletins (TSBs) from the National Highway Traffic Safety Administration (NHTSA) for fender splash shield failures on the 2019-2023 Audi Q8. Failures are typically isolated incidents of physical damage rather than a manufacturing or design defect. While other recalls exist for the Q8, none pertain to the fender liners.

However, Audi did issue TSB 2064998 for the related outer wheel arch trim on 2019-2021 Q8, SQ8, and RS Q8 models. This bulletin addresses the painted trim piece on the rear door becoming loose or detaching. If you have loose trim in this area, it is a separate issue from the inner fender liner.

Buying a Used Fender Splash Shield: What to Check

A used OEM fender shield is often an excellent value, providing the same quality and fit as a new part for a fraction of the price. However, a careful inspection is essential before buying.

Physical Inspection Checklist

• Verify All Mounting Points: This is the most important step. Carefully inspect every mounting hole and tab around the edge of the liner. Reject any part with cracked, broken, or elongated holes, as it will not install securely and will eventually come loose.
• Check the Part Number: Locate the OEM part number sticker or stamp on the part itself. Confirm it matches the required number for your vehicle's model (Q8), year, and side (left or right). Do not rely on visual appearance alone.
• Inspect for Cracks and Tears: Look for any major cracks, splits, or holes in the main body of the liner. While minor scuffs are normal, significant damage compromises its ability to protect the vehicle.
• Look for Brittleness: The plastic should still have some flexibility. If it feels excessively brittle or is faded from sun exposure, it may crack easily during installation or use.

Why Used OEM is a Smart Buy

For a part like a fender shield, choosing a quality used OEM part is almost always better than a new aftermarket one. New aftermarket liners are cheaper but are often made from thinner, flimsier plastic that doesn't fit correctly. This poor fit can lead to misaligned mounting holes, gaps that let in debris, and the same rubbing or flapping noises you were trying to fix. A used OEM part guarantees the correct material durability and a perfect fit, just as the factory intended.

Replacement Guide

Replacing a fender splash shield is a straightforward job that most DIYers can handle with basic tools.

• Installation Difficulty: 2 out of 5
• Estimated Time: 0.75 - 1.5 hours
• Tools Required: Jack and jack stands, lug wrench, Torx driver set (commonly T25), trim clip removal tool or flathead screwdriver.
🎬 Watch: How to remove Audi wheel arch lining clips

Step-by-Step Process

1. Safely jack up the vehicle and support it with a jack stand.
2. Remove the wheel on the side you are working on.
3. Locate and remove all the Torx screws and plastic push-clips that secure the liner to the fender, bumper, and chassis.
4. Carefully pull the old, damaged liner out of the wheel well.
🎬 See this Audi wheel arch liner removal walkthrough
5. Maneuver the new liner into position, ensuring all mounting holes line up correctly.
6. Install all screws and clips to secure the new liner. Do not overtighten.
7. Reinstall the wheel, lower the vehicle, and torque the lug nuts to the manufacturer's specification.

Cost Comparison: New vs. Used vs. Aftermarket

OEM Part Numbers

Part numbers are frequently updated by the manufacturer. The original part is superseded by newer versions. The numbers below are for reference; always confirm the exact part number for your vehicle's VIN. The part is side-specific.

• Front Right (Passenger Side): 4M8810172K (replaces 4M8810172D, 4M8810172B)
• Front Left (Driver Side): The corresponding left-side part number is 4M8810171K (and its earlier revisions).

Note: Some parts diagrams may use a different prefix, such as 4M8-821-172-K for the front right liner. Always verify with a dealer or trusted parts supplier.

Frequently Asked Questions (FAQ)