Where to buy car parts and what to expect

You can buy car replacement parts from five main sources: the car manufacturer's dealership, independent auto parts retailers, online marketplaces, salvage yards, and local mechanics. Each route has different prices, return policies, and how long it takes to get what you need. The dealership stocks parts made specifically for your car model and guarantees they will fit, but costs more. Independent retailers like AutoZone, O'Reilly, and NAPA stock common parts for many vehicles at lower prices and often let you return unused items. Online sellers including Amazon and eBay offer the widest selection and sometimes the lowest prices, but you cannot inspect the part before buying and shipping takes time. Salvage yards sell used parts pulled from wrecked cars at steep discounts, though you take on the risk that the part may have hidden damage. Local mechanics often order parts for you and mark up the cost, but handle the installation too.

Before you buy anything, you need to know exactly what part you are replacing. Write down your car's year, make, model, and engine size — this information is on your registration or inside the driver's door jamb. Many retailers let you search by these details and will show you only parts that fit your specific vehicle. If you are not sure what part you need, describe the problem to a parts counter person or a mechanic, and they can narrow it down for you.

Key Takeaways

  • Dealerships may provide fit and quality but charge the most; independent retailers offer lower prices on common parts; online sellers have the widest selection but longer delivery times.
  • Always provide your car's year, make, model, and engine size when searching for parts, because the same part name can refer to different components across vehicle types.
  • OEM parts are made by the car manufacturer and fit perfectly; aftermarket parts are made by third parties and cost less but vary in quality depending on the brand.
  • Salvage yards sell used parts at the lowest prices, but you cannot return them and they may fail sooner than new parts.
  • Check return policies before buying online, because some sellers do not accept returns on parts once they leave the warehouse.

OEM parts versus aftermarket parts

OEM parts are manufactured by your car's maker or by suppliers under contract to the manufacturer. They are the same parts that came on your car when it was new. Dealerships stock OEM parts and can order any part that exists for your model. OEM parts cost more than aftermarket alternatives, sometimes significantly more, but they fit perfectly and carry a warranty from the manufacturer.

Aftermarket parts are made by independent companies and sold under their own brand names. They perform the same function as OEM parts but may come from different factories with different quality standards. Some aftermarket brands are nearly identical in quality to OEM parts and cost 30 to 50 percent less. Others are cheaper but wear out faster or fit loosely. Independent retailers and online sellers stock mostly aftermarket parts because the markup is higher and customers have more choices. If you choose aftermarket, look for brands with good reviews on the retailer's website or ask a mechanic which brands they trust.

How to search for the right part

Start by identifying what you need to replace. If your check engine light is on, a mechanic or auto parts store can read the code for free and tell you which part is likely the problem. If something is broken or worn, describe the symptom — the part is leaking, making noise, not working — and a parts counter person can help you find it. Once you know the part name, search the retailer's website or database by your vehicle's year, make, and model. The system will filter results to show only parts that fit your car.

Write down the part number before you buy. Part numbers are printed on the box and on the part itself. If you order online and the part arrives wrong, the part number proves what you ordered and makes returns easier. Some retailers let you compare prices across their store by part number, so you can see whether a premium brand costs enough more to justify the difference. Read customer reviews if they are available, especially for parts you have never bought before. A part with hundreds of five-star reviews is usually safer than an unknown brand with no reviews.

Returning parts and understanding warranties

Return policies vary widely. Most independent retailers like AutoZone and O'Reilly accept returns of unused parts within 30 to 90 days if you have your receipt. Dealerships usually accept returns within a shorter window, sometimes 14 days. Online marketplaces like Amazon have their own return policies — some allow 30 days, others do not accept returns on parts at all. Salvage yard parts are almost never returnable because they are used and cannot be resold. Before you buy online, scroll to the return policy section and read it. If you are not sure whether a part will work, ask the seller whether you can return it if it does not fit.

Warranties on new parts typically last one to three years from the date of purchase, though some cover only defects and not normal wear. OEM parts usually carry the manufacturer's warranty. Aftermarket parts carry the brand's warranty, which varies by company. Keep your receipt and the part number in case you need to file a warranty claim. If a part fails and you have the receipt, the retailer or manufacturer will usually replace it or refund your money.

Buying used parts from salvage yards

Salvage yards, also called junkyards or auto recyclers, buy wrecked and end-of-life vehicles, pull usable parts, and sell them at a fraction of new prices. A used alternator or starter motor from a salvage yard might cost one-third what a new one costs. Salvage yards are worth considering if you are on a tight budget or need an older part that is no longer in production. Call ahead with your car's year, make, and model, and ask whether they have the part in stock. Many yards let you pull the part yourself, which costs less than having them remove it.

The trade-off is that you cannot test a used part before buying it, and you cannot return it. A part may have been damaged in the wreck or may fail soon after you install it. Some salvage yards offer a short warranty — 30 to 90 days — but many do not. If you buy from a salvage yard, inspect the part carefully before you leave. Look for cracks, corrosion, loose connections, or signs of damage. Ask the yard staff how the part was removed and whether it was working when they took it out.

Comparing prices and shipping costs

Price is not the only cost. When you compare online sellers, add the shipping cost to the part price. A part that looks cheap may cost more once shipping is included. Some retailers offer free shipping over a certain order amount, so buying multiple parts at once can save money. Local pickup is usually free or cheap, so check whether the retailer has a store near you. Dealerships do not ship; you pick up parts at the dealership or have them delivered to a mechanic who works with that dealership.

Delivery time matters if your car is not running. Independent retailers usually have parts in stock and can have them ready the same day or next day. Online sellers may take three to seven business days to ship, and then another few days to arrive. If you need a part urgently, a local retailer or dealership is faster than ordering online. Some online sellers offer expedited shipping for an extra fee, which can get a part to you in one or two days if you are willing to pay for it.

When to replace parts yourself versus using a mechanic

Some parts are straightforward to replace yourself if you have basic tools and a little mechanical knowledge. Air filters, cabin filters, wiper blades, and battery terminals can usually be changed in under an hour with no special skills. Brake pads, spark plugs, and oil filters require a bit more knowledge but are still within reach for someone willing to follow instructions. Other parts — transmissions, engine blocks, suspension components — require specialized tools and knowledge and should be left to a mechanic.

If you decide to install a part yourself, watch a video tutorial for your specific car model first. YouTube has thousands of step-by-step guides. If the job looks complicated or requires lifting the car, take it to a mechanic. A mechanic can also diagnose the problem for you, which saves you from buying the wrong part. Many mechanics charge a diagnostic fee — usually $50 to $150 — but that fee is often waived if you have them do the repair. If you buy the part yourself and bring it to a mechanic to install, some shops charge a labor fee to put in a customer-supplied part, while others do not.

Frequently Asked Questions

What is the difference between OEM and aftermarket parts?

OEM parts are made by your car's manufacturer and fit perfectly, but cost more. Aftermarket parts are made by independent companies and cost less, but quality varies by brand. Some aftermarket parts are nearly as good as OEM; others wear out faster. Ask a mechanic which aftermarket brands they recommend for your car.

Can I return a part if it does not fit?

Most independent retailers accept returns of unused parts within 30 to 90 days with a receipt. Online sellers have different policies — some allow returns, others do not. Always check the return policy before you buy. Salvage yard parts are almost never returnable.

How do I know which part I need?

Write down your car's year, make, model, and engine size. Describe the problem to a parts counter person or mechanic, and they can identify the part. You can also search online by your vehicle details and the symptom — for example, "2015 Honda Civic air filter" — and the results will show you what fits.

Is it cheaper to buy parts online or at a local store?

Online prices are often lower, but add shipping costs to compare fairly. Local stores may have the part in stock for same-day pickup, which saves time. If you need the part urgently, a local retailer is usually faster and cheaper than waiting for shipping.

Should I buy used parts from a salvage yard?

Used parts cost much less than new ones, but you cannot test them before buying and cannot return them. Salvage yards work best for older cars or hard-to-find parts. Inspect the part carefully before you leave, and ask the yard staff whether it was working when they removed it.