OEM vs Aftermarket Parts: What You Need to Know

What Are OEM Parts?

OEM stands for Original Equipment Manufacturer. These are parts made by the same company that manufactured the original parts on your vehicle. If you drive a Toyota, an OEM fender is made by Toyota (or their contracted supplier) to the exact same specifications as the one that came on your car from the factory.

OEM parts are guaranteed to fit correctly, match the original finish quality, and meet the manufacturer's safety and structural specifications. They come with the manufacturer's warranty and are identical in every way to what was on your car before the accident.

What Are Aftermarket Parts?

Aftermarket parts are made by third-party manufacturers, not the vehicle's original maker. These companies reverse-engineer the original part and produce their own version. The quality varies enormously -- some aftermarket manufacturers produce parts that are nearly indistinguishable from OEM, while others produce parts with noticeable fit, finish, and durability differences.

Common issues with lower-quality aftermarket parts include:

• Poor fit -- gaps between panels, uneven alignment, parts that require modification to install
• Inferior paint adhesion -- the primer and coating on aftermarket parts may not hold paint as well, leading to peeling or fading
• Thinner materials -- some aftermarket panels use thinner gauge metal, which affects crash performance
• Missing features -- brackets, clips, reinforcements, or sensor mounts may be absent or different

Why Do Insurance Companies Prefer Aftermarket?

The answer is simple: cost. Aftermarket parts can cost 30-60% less than their OEM equivalents. When an insurance company is paying for repairs, they have a financial incentive to use the least expensive parts that will restore the vehicle's appearance.

Many insurance policies include language that allows the use of "like kind and quality" (LKQ) parts, which can include aftermarket or used parts. However, "like kind and quality" is subjective, and what an insurance company considers equivalent may not actually match the original part's quality, fit, or performance.

Your Rights Regarding Parts in California

California has specific regulations about parts used in collision repair:

• Insurance companies must disclose in writing when aftermarket parts will be used in your repair
• Aftermarket parts must be at least equal in kind, quality, safety, fit, and performance to the original parts
• You have the right to request OEM parts -- though your policy may require you to pay the difference in cost
• If your vehicle is under the manufacturer's warranty, using aftermarket structural or safety parts could potentially void warranty coverage for related components

When OEM Parts Matter Most

Not every part on your vehicle needs to be OEM. For cosmetic trim pieces or minor components, a quality aftermarket part may be perfectly acceptable. However, OEM parts are strongly recommended for:

• Structural components -- frame rails, aprons, pillars, and structural reinforcements that affect crash safety
• Safety systems -- anything related to airbag deployment, crumple zones, or occupant protection
• Body panels on newer vehicles -- modern cars use advanced high-strength steel and aluminum that require precise manufacturing tolerances
• Vehicles with active safety features -- radar sensors, cameras, and lidar systems are calibrated to factory panel positions

The Hidden Cost of Cheap Parts

A repair done with poor-quality aftermarket parts may look acceptable at first, but problems often emerge over time. Paint that does not adhere properly will chip and peel. Panels with poor fit allow water intrusion that leads to corrosion. Structural parts that are not up to specification compromise your safety in a future accident.

When you factor in the cost of coming back to fix these issues, the "savings" from aftermarket parts evaporate quickly. A quality repair done right the first time is always more cost-effective in the long run.

How to Request OEM Parts

1. Review your policy -- Some policies include OEM part coverage, especially for newer vehicles. Check your declarations page or call your agent.
2. Ask your shop -- A good body shop will advocate for OEM parts when they matter and explain where aftermarket is acceptable.
3. Put it in writing -- Request OEM parts in writing to your insurance company. If they refuse, ask them to document why and specify which "equivalent" parts they are substituting.
4. Consider the difference -- If your insurer will not cover OEM, ask what the price difference would be. For critical components, the out-of-pocket cost may be worth it.

What We Do at Drive Auto Body

At Drive Auto Body, we believe in transparency about parts. We discuss your options before beginning any repair and advocate to your insurance company for the parts your vehicle needs. For structural and safety-related components, we always push for OEM specifications. We will never install a part we would not put on our own vehicles.

If you have questions about what parts are being used in your repair -- or if you want a second opinion on an insurance estimate that specifies aftermarket parts -- call us. We are happy to review it with you at no charge.