5 Common Fitment Mistakes That Are Costing You Sales on Amazon & eBay
If you sell auto parts on marketplaces like Amazon or eBay, you already know how important vehicle fitment accuracy is. One wrong YMM (Year-Make-Model) match can mean returns, negative reviews, and account warnings. But the real danger? You’re losing sales you never knew existed.
Here are the 5 most common fitment mistakes auto sellers make—and how to fix them.
1. Missing or Incomplete ACES Data
The mistake:
Listing a product with vague or missing ACES (Aftermarket Catalog Exchange Standard) data—or skipping it entirely.
Why it hurts:
Your product won’t show up in filtered search results when buyers search by vehicle compatibility. Even worse, marketplaces may suppress your listing or mark it as incomplete.
The Solution:
Use a tool or service that helps you build and validate ACES-compliant fitment data before uploading. This ensures your part shows up where and when it should.
2. Incomplete Mapping of Compatible Vehicles
The mistake:
Only mapping your product to one or two vehicles when it actually fits 15–20.
Why it hurts:
You’re losing visibility in search—and losing to competitors who fully mapped their fitment coverage.
The Solution:
Always reference OE fitment guides or use a professional fitment mapping service to get full coverage. Tools that generate coverage reports can help you identify what you’re missing.
3. Wrong Part-Type or Category Selection
The mistake:
Assigning the wrong part-type (like using “Shock Absorber” instead of “Strut Assembly”) in your listing or ACES file.
Why it hurts:
Your listing may appear in irrelevant searches—or not at all. Amazon especially may flag or remove it due to category mismatch.
The Solution:
Verify your part-type ID against the latest AutoCare VCdb & PCdb databases. Using an ACES & PIES Viewer can help avoid costly errors before uploading.
4. Not Syncing Fitment Across Marketplaces
The mistake:
Uploading different fitment data to Amazon, eBay, and Walmart manually—or skipping some platforms altogether.
Why it hurts:
Inconsistencies confuse customers and cause return rates to spike. Plus, managing it manually leads to burnout and errors.
The Solution:
Use a centralized fitment management platform to sync and submit accurate data across all major marketplaces with one update.
5. No Fitment Search on Your Website
The mistake:
Running a Shopify, WooCommerce, or BigCommerce auto parts store without a YMM search tool.
Why it hurts:
Customers can’t quickly verify compatibility. If they’re unsure, they’ll leave—or worse, buy the wrong part and return it.
The fix:
Integrate a YMM (Year-Make-Model) vehicle lookup directly on your site. PCFitment offers ready-to-install YMM tools for eCommerce platforms that reduce return rates and boost conversions.
Ready to Fix Your Fitment Data?
Fitment mistakes cost sellers thousands in lost revenue every year. Whether you’re selling 50 SKUs or 5,000+, getting your data right is the key to scaling.
We at PCFitment help Amazon, eBay, and DTC sellers:
- Build & validate ACES PIES data
- Map full vehicle compatibility
- Sync fitment across platforms
- Add YMM search to their website
- Generate coverage reports & PDFs
Want a free fitment audit?
Send us 10 part numbers, and we’ll show you exactly where you’re missing sales. Connect with us at support@partsconnect.us
