Many people want to sell car parts and accessories online but struggle with deciding which sales channel to use.
Car parts are a category well suited to online sales, but they are also prone to trouble such as "I bought it, but it didn't fit my car."
This article explains why selling car parts online is difficult, the main sales methods available, points to watch when handling used parts, and why you should consider your own EC site once you start feeling the limits of marketplace sales.
Why Selling Car Parts Online Is Difficult
Compared with general retail, selling car parts involves managing more types of information, which tends to add extra work to product page design and inventory management. There are four main reasons for this.
Missing fitment information often leads to returns and complaints
A lack of fitment information easily leads to trouble when selling car parts. Fitment information indicates which vehicle model, chassis code, model year, and grade a given part is compatible with.
Even for the same vehicle model, the parts that fit can differ by model year or grade, so it's important to clearly state the vehicle model, chassis code, model year, genuine part number, and compatible part numbers.
Many model numbers and SKUs make product management complex
Car parts are a product category where the number of listings and SKUs (the management unit used for inventory per item) tends to increase.
Even parts with the same name must be managed as separate products if the compatible vehicle model or model year differs. You also need to organize genuine part numbers, compatible part numbers, colors, and left/right differences.
If product information keeps growing without being clearly organized, mistakes such as mixed-up inventory or incorrect shipments become more likely.
Large differences in weight and size make shipping rates hard to design
Another characteristic of car parts is the large difference in weight and size between products. Some are small electrical components or interior parts, while others—such as tires, wheels, bumpers, and mufflers—are large and tend to carry high shipping costs.
A flat shipping rate can make small items look overpriced while making the shipping burden too heavy for large items. Costs also vary by delivery region and package size, so you need to confirm that your business remains profitable once shipping is factored in.
Used parts require checking for differences in condition and necessary permits
Used parts vary in condition far more than new ones. You need to clearly convey details such as scratches, dirt, missing components, whether functionality has been tested, how long the part was used, and whether it is being sold as junk.
Depending on how you source and sell the parts, you may also need a secondhand dealer license or procedures under Japan's End-of-Life Vehicle Recycling Act. Check with your local police station or municipal authority as needed.
Main Ways to Sell Car Parts Online
Broadly speaking, there are three options for selling car parts online: "listing on EC marketplaces and flea-market apps," "building your own EC site," and "using both together."
EC marketplaces and flea-market apps
EC marketplaces such as Amazon, Rakuten Ichiba, and Yahoo! Shopping, as well as flea-market and auction services such as Mercari and Yahoo! Auctions, already attract large numbers of users, so they make it easy to reach buyers. They're easy to start with low upfront costs, and infrastructure for payments and customer support is already in place.
On the other hand, they come with constraints such as selling fees and other costs, product page layouts and displayable information being limited by the platform's specifications, and difficulty owning customer data yourself.
Your own EC site
Your own EC site is a sales method where you can design your own product pages and sales funnel. It's easier to organize fitment information such as vehicle model and chassis code on product pages, and you can also adjust how your brand is presented and set your own shipping rules.
Another benefit is that you can own customer data such as email addresses and purchase history yourself, making it easier to run initiatives that lead to repeat purchases.
Using marketplaces and your own EC site together
Running marketplace listings alongside your own EC site is also an effective approach. The idea is to use marketplaces as a place to reach new customers while growing your own EC site as the foundation for repeat purchases.
It's fine to start with a marketplace focus, but as your sales volume grows, the risks and fee burden of relying on marketplaces tend to become more of an issue, so building the foundation for your own EC site early makes things easier to manage in the long run.
Points to Watch When Selling Used Parts Online
When selling used parts online, you need to pay attention not only to product descriptions but also to permits and legally required disclosures. The procedures required vary depending on what you handle and your region, so check in advance.
Check secondhand dealer licensing and URL registration requirements
If you buy and resell used parts, you need a secondhand dealer license under the Secondhand Articles Dealers Act. If you conduct secondhand transactions through your own site, you must also register the URL you use with the Public Safety Commission.
For secondhand dealer licensing, refer to the National Police Agency's page "About Secondhand Dealer and Pawnbroker Business" (Japanese) as well as your prefectural police's guidance on URL registration.
Check dismantling business licensing and procedures under the End-of-Life Vehicle Recycling Act
If you remove parts from end-of-life vehicles and sell them, procedures under the End-of-Life Vehicle Recycling Act come into play. The requirements differ between purchasing used parts for resale and dismantling a vehicle yourself to salvage parts, so check with your municipality or the relevant authority.
For information on the End-of-Life Vehicle Recycling Act, the Ministry of the Environment's overview page "Overview of Vehicle Recycling" (Japanese) is a useful reference.
Check disclosure rules such as the Product Liability Act and Act on Specified Commercial Transactions
Even for used parts, you need to check rules that apply at the time of sale, such as the Product Liability Act (PL Act) and the Act on Specified Commercial Transactions. For parts that carry a risk of accidents or malfunctions, clearly organize your precautions, sales conditions, and return conditions.
For information on the PL Act and disclosure rules for mail-order sales, check the Consumer Affairs Agency's "Overview Q&A of the Product Liability Act" and "Guide to the Act on Specified Commercial Transactions" (both in Japanese).
Clearly state condition, functionality checks, and return conditions
For used parts, it's important to carefully convey the condition of each individual item. Clearly note any scratches or dirt, missing components, the results of functionality checks, whether a warranty is included, and the reason a part is being sold as junk.
Product photos matter as well. In addition to overall shots, include images of areas buyers want to check, such as scratches, mounting points, connectors, and part number labels. It also helps to decide in advance which cases you will handle—incorrect fitment, initial defects, damage in transit, or returns due to the buyer's own reasons—so you can respond with confidence.
Consider Your Own EC Site Once You Feel the Limits of Marketplace Sales
If you're already selling on marketplaces or flea-market apps, the challenges of relying on them tend to become clearer as your sales volume grows. If you're feeling the pinch of fees, limited freedom on product pages, or difficulty generating repeat purchases, it's time to consider adding your own EC site.
Fee burden is squeezing your profit
Marketplace sales can involve selling fees, payment processing fees, and optional charges. Looking only at the sale price might make it seem like you're turning a profit, but once you subtract shipping, packaging costs, and fees, there may be nothing left. If the fee burden feels heavy, it's a good time to consider shifting toward your own EC site.
Limited freedom on product pages makes it hard to stand out
On marketplaces, the layout, number of images, and order in which information is displayed on product pages all depend on the platform's specifications. It's often difficult to realize things like a clear, easy-to-read fitment chart by vehicle model or a search feature built around genuine part numbers.
With your own EC site, you can design how fitment information is presented, how product descriptions are structured, and how related products are suggested. Being able to express your brand's identity while creating product pages that are easy for buyers to understand is a strength unique to running your own EC site.
Sales don't lead to repeat purchases
Customers who buy through a marketplace tend to complete their next purchase within that same marketplace, making it structurally difficult for them to become direct repeat customers of your business. However, car parts and accessories are a category where repeat purchases are common, including consumables and parts needed for regular maintenance.
If you own customer data through your own EC site, you can take approaches that drive repeat purchases, such as reminders timed to an oil change cycle or suggestions for related parts based on the customer's vehicle.
Why Shopify Is Well Suited to Selling Car Parts Online
Image source: Shopify
For products with complex information like car parts, having a system that makes it easy to organize product data and shipping rules is important. Shopify is an EC platform well suited to addressing the challenges of selling car parts, thanks to its flexible product data design and detailed shipping rate settings.
Easy to organize fitment information as product data
Shopify lets you manage product information using product descriptions, tags, variants, and metafields. Metafields are a feature that lets you add your own custom fields in addition to standard product information.
You can organize vehicle model, chassis code, model year, genuine part number, compatible part numbers, and mounting position as product data, making it easier to build search and filtering functionality around them.
Capture buyers who arrive via part-number searches without losing them
Many buyers looking for car parts search not just by product name but by part number or genuine part number. On Shopify, organizing part number information into your product titles, descriptions, and metafields makes it easier to capture this kind of search traffic.
Easy to design weight-based shipping rates and delivery rules
On Shopify, you can set a weight for each product and configure weight-based shipping rates. Using shipping profiles, you can set different shipping rules for small parts versus large parts, or apply different delivery conditions to specific product categories.
Having this level of freedom in designing your shipping rates helps not only maintain your profit margin but also makes it easier for buyers to understand shipping costs upfront.
Easy to run your own EC site alongside marketplaces
Shopify also stands out for having a rich ecosystem of integration apps and tools, making it easy to run your own EC site as your hub while operating marketplaces in parallel. For example, the official Shopify app "Shopify Marketplace Connect" lets you sync product catalogs and inventory with overseas marketplaces like Amazon and eBay. For domestic Japanese marketplaces such as Rakuten Ichiba and Yahoo! Shopping, it's common to combine a third-party centralized management tool.
Even if you're already continuing to sell on marketplaces, this makes it easy to set up a structure where Shopify serves as the foundation of your own EC site while you run multiple channels in parallel.
If you'd like to know the typical costs of building your own EC site with Shopify, the following article may also be helpful.
Use Your Own EC Site to Build a Solid Foundation for Selling Car Parts Online
When selling car parts online, it's important to organize fitment information and clearly describe the condition of used parts. Insufficient information tends to lead to more returns and inquiries.
While EC marketplaces and flea-market apps are easy to start with, you may run into challenges around limited freedom on product pages, fees and other costs, and difficulty driving repeat purchases. If you plan to sell car parts on an ongoing basis, it's worth considering your own EC site.
Rather than relying solely on marketplace sales, building a sales foundation suited to your business helps set you up for online sales that are easy to sustain over the long term.
