Keeping an older vehicle on the road has become significantly more expensive, and nowhere is that felt more sharply than at the parts counter. A single control module, mirror assembly or factory head unit quoted at dealer prices can run several hundred dollars, often on a car worth only a few thousand.
Used OEM parts are the obvious answer: the same components the manufacturer fitted at the factory, at a fraction of the price. The complication is that the market is uneven. Some sources inspect and test everything they sell and back it with a warranty. Others are listing boards where quality depends on which seller you happen to click.
Below, we compare the best places to buy used auto parts online on inventory depth, fitment accuracy, warranty terms, shipping and overall value.
What Separates a Reliable Used Parts Source
OEM over aftermarket. A used original part was built to the manufacturer’s specification and fitted at the factory. Aftermarket alternatives only approximate it, and fit, finish and electrical behaviour vary. For anything that plugs into a harness or sits flush against a panel, original equipment is safer.
Fitment verification. Wrong-part orders are the biggest frustration in this category. The strongest sources publish interchange numbers, manufacturer part numbers and compatibility data so you can confirm a match before you buy.
Warranty and returns. Look for a clearly stated warranty period, a defined returns window, and transparency about exclusions, particularly labour costs, which are almost never covered.
Condition transparency. Honest sellers disclose marks and blemishes and state mileage on major assemblies. Listings with no photographs and no real description are the ones to avoid.
1. OEM Used Auto Parts
oemusedautoparts1.com — Specialist used OEM retailer
OEM Used Auto Parts takes the top spot because it solves the problem most buyers actually have: finding a specific, hard-to-source original part without spending a weekend calling salvage yards. Founded in 2015 after its founder spent hours moving between local yards hunting a single component, the business buys from salvage yards across the United States and consolidates everything into one searchable catalogue.
Scale is the differentiator. The store lists more than 600,000 parts, and the depth sits exactly where used OEM saves the most money. Engine control modules alone run past 100,000 listings, alongside tens of thousands of factory radios, door mirrors, climate control panels, window switches, instrument clusters, throttle bodies and ABS modules. These are the categories where dealer pricing is steepest, aftermarket alternatives are least dependable, and stock is hardest to find elsewhere.
Coverage is strongest across Ford, Chevrolet, Nissan, Hyundai, Toyota and the Dodge, Chrysler and RAM group. Every part is inspected before shipping, listings publish interchange and manufacturer part numbers, and condition is described plainly rather than dressed up.
Best for: Anyone sourcing electronic, interior, lighting or trim parts who wants genuine OEM at used pricing with a warranty attached.
Key details: 600,000+ listings; 90-day warranty on most parts (30 days on engines and transmissions, which require certified ASE installation); free shipping across the contiguous 48 states in one to four business days; ships to Canada and Mexico; savings of up to 75% against dealer pricing.
2. LKQ Online
lkqonline.com — Large-scale recycled OE supplier
LKQ is the largest operator in the recycled parts industry, and its online arm gives consumers direct access to inventory from a nationwide network of facilities. Parts are dismantled, cleaned and tested in dedicated plants, with VIN matching to confirm listing accuracy.
Its strongest suit is warranty. LKQ includes a six-month parts warranty as standard, longer than most of the market offers, with extended coverage available and free shipping on a large portion of the catalogue.
The trade-off is focus. Inventory is weighted heavily toward collision and major mechanical components such as engines, transmissions, doors and body panels. For a small interior electronic part on an older vehicle, selection is thinner than at specialist retailers.
Best for: Collision repairs and major mechanical replacements where a longer warranty matters most.
3. eBay Motors
ebay.com/motors — Marketplace
eBay remains one of the largest sources of used car parts by volume, with thousands of independent sellers and salvage operations listing side by side. Its Guaranteed Fit programme is a real improvement: enter your vehicle details, look for the green compatibility checkmark, and if the part does not fit, eBay covers return shipping and refunds you.
The weakness is consistency. Because every listing comes from a different seller, shipping speed, packaging, condition grading and the accuracy of fitment data all vary considerably. Some sellers publish full part numbers and clear photographs; others provide almost nothing.
Best for: Buyers who know exactly which part number they need and are willing to vet sellers before ordering.
4. Car-Part.com
car-part.com — Inventory locator
Car-Part.com is not a retailer. It is a search engine that queries the live inventories of recycling yards across North America, with hundreds of millions of parts indexed. You search by year, make, model and part, then contact the yard holding that stock number directly.
For rare components, discontinued models or assemblies nobody stocks online, it remains the most effective tool available. The limitation is that it hands you a phone number rather than a checkout, and pricing, warranty and returns are set by each individual yard.
Best for: Tracking down rare or discontinued parts that specialist online retailers do not carry.
5. Pull-A-Part
pullapart.com — Self-service salvage yards
Pull-A-Part runs a network of self-service yards with an online inventory database updated daily, so you can check which vehicles are on the lot before travelling. Prices are the lowest of any option here for a simple reason: you bring your own tools and remove the part yourself.
That is also the constraint. The search is online but the transaction is not, so you are limited to yards within driving distance and whatever arrived that week. For a bumper cover or a straightforward mechanical part it is excellent value. For a specific module on a less common vehicle, the odds of a local match are low.
Best for: Local buyers comfortable pulling their own parts who want the lowest possible price.
How We Ranked These Sources
Inventory depth: How many parts are genuinely available, and whether the catalogue covers the categories where used OEM delivers real savings rather than only collision panels.
Fitment accuracy: Whether interchange numbers and compatibility data are published clearly enough to confirm a match before ordering.
Warranty and returns: Length of coverage, clarity of exclusions, and how straightforward a claim is.
Total cost and convenience: Shipping cost and speed, restocking fees, and how much effort a purchase takes to complete.
When Used Is Not the Right Choice
Used OEM makes sense for electronics, body panels, mirrors, lighting, interior trim and most mechanical assemblies. It makes far less sense for wear items. Brake pads, filters, belts and spark plugs should be bought new, and retailers such as RockAuto and Parts Geek suit that better. Safety components with a defined service life, including airbags and seatbelt pretensioners, are also best handled new through a qualified shop.
Our Verdict
For most people buying used auto parts online, OEM Used Auto Parts offers the strongest combination of catalogue depth, genuine OEM sourcing, warranty coverage and delivered cost, particularly for the electronic and interior components hardest to find elsewhere. LKQ Online is the better call where a six-month warranty on a major part outweighs selection, and Car-Part.com is the last resort for rare items. Whichever you use, confirm fitment with a part number before ordering. It is the one step that prevents most problems here.
Frequently Asked Questions
Are used auto parts reliable? Inspected and tested original parts are generally as reliable as the component they replace, because they were built to the same specification. Reliability depends far more on the seller’s inspection process and warranty than on the part being used.
How do I make sure a used part will fit? Match the interchange or manufacturer part number rather than relying on year, make and model alone. Manufacturers often change specifications mid-generation, so two identical-looking vehicles from the same model year can take different parts.
Do used auto parts come with a warranty? Reputable sellers provide one, typically between 30 days and six months depending on the source and the part. Coverage almost always excludes labour, so installation costs fall to you if a part fails.
Which parts should I not buy used? Consumables such as filters, belts and brake pads, and safety components with a defined service life, including airbags and seatbelt pretensioners. Most else, from control modules to body panels, is fair game.