2023-2025 Mazda CX-5 Lower Door Trim: Piano Black Finish & Damage Guide

Part Identification and Finish Verification

This guide covers the front, driver-side lower door molding for the 2023-2025 Mazda CX-5. The primary OEM part numbers for this piece are KPG1-51-RBX and KPG1-51RB1. It is crucial to note that this specific trim piece comes in a Piano Black finish, not a body-matched color like Machine Gray. While other trim on the vehicle, such as the wheel arch moldings, may be painted, this lower door garnish is consistently Piano Black across various trim levels that use it.

Known Issues for 2023-2025 Models

As these are relatively new model years, widespread systemic failures are not yet documented. However, owners have reported isolated but notable issues:

• Melting from Reflected Sunlight: There are owner reports of the plastic exterior trim, including side moldings, melting or deforming when parked near energy-efficient windows. These Low-E windows can focus sunlight like a magnifying glass, causing localized heat damage that is not covered by the manufacturer's warranty. When parking for extended periods, be mindful of parking next to large glass-paneled buildings.
• Physical Damage: The most common reason for replacement is physical damage. Due to its low mounting position, this panel is susceptible to cracks and deep scratches from road debris, curb impacts, and improper use of a jack or lift.

Symptoms of a Failing Lower Door Molding

Failure of this part is almost always visual or audible. There are no associated fault codes or electronic symptoms.

• Visible Cracks or Scratches: The glossy Piano Black finish makes scratches and scuffs highly visible. Deeper impacts can cause the plastic to crack or break entirely.
• Looseness or Rattling: The panel is held on by clips. If clips are broken from impact or improper removal, the molding can become loose. You might hear it rattle or vibrate while driving, especially at higher speeds.
• Discoloration or Fading: While less common on new vehicles, harsh chemicals or excessive UV exposure could eventually cause the black finish to fade or appear chalky. The melting issue noted above is an extreme form of this.

Buying a Used 2023-2025 CX-5 Door Molding: A Step-by-Step Guide

Purchasing a used OEM molding is an excellent way to save money, especially since fitment is critical on modern vehicles. Here’s what to look for to ensure you get a quality part.

1. Verify the Part Number and Side

Double-check that you are buying KPG1-51-RBX or KPG1-51RB1 for the driver's side. Do not assume it will fit the other side. A listing should clearly state the part number and the side of the vehicle it came from.

2. How to Verify Your Vehicle's Paint Code

While this specific part is Piano Black, knowing your vehicle's main paint code is a valuable skill for buying other exterior parts. The paint code for all Mazda vehicles, including the CX-5, is located on the manufacturer's sticker inside the driver's side door jamb. The code is typically a two or three-character mix of letters and numbers, such as 46G for Machine Gray Metallic or 46V for Soul Red Crystal Metallic.

3. Physical Inspection Checklist

For a used trim panel, a detailed physical inspection is everything. Pay close attention to the following:

• All Mounting Tabs Intact: This is the most critical inspection point. Turn the panel over and check every single mounting tab and clip receiver. If even one is broken, the panel may not sit flush against the door and could rattle or fall off.
• Scratches and Scuffs: The Piano Black finish is prone to scratching. Minor surface swirls may be buffed out, but deep scratches that catch your fingernail are permanent.
🎬 See how to buff out scratches from Piano Black trim
• Cracks and Stress Marks: Flex the part gently. Look for any hairline cracks, especially around the mounting points. White stress marks in the plastic indicate it has been bent or impacted.
• Clear Coat Condition: Ensure the glossy finish is even and not peeling or hazy, which could indicate a poor quality repair or chemical damage.

4. OEM vs. Aftermarket Quality

For a cosmetic part on a new vehicle like the 2023-2025 CX-5, choosing a used Original Equipment Manufacturer (OEM) part over a new aftermarket one is highly recommended. OEM parts are made by Mazda and are guaranteed to fit perfectly, matching the exact contours of the door. Aftermarket parts are made by third-party companies and can suffer from poor fitment, leaving unsightly gaps or not aligning correctly with other body panels. They may also use lower-quality plastic that fades or becomes brittle more quickly.

Cost Comparison

Frequently Asked Questions (FAQ)