OEM vs. Aftermarket Parts: What Belongs on Your Car

When your insurance estimate lists "LKQ" or "A/M" parts, you are not looking at the same components that came on your car from the factory. Sometimes that is fine. Sometimes it is a problem. Here is how to tell the difference.

The Three Categories **OEM (Original Equipment Manufacturer)** parts are made by the company that supplied your car's manufacturer. They match factory specs exactly.

**Aftermarket** parts are made by third-party manufacturers. Quality varies enormously — some are CAPA-certified and nearly identical to OEM, others fit poorly and corrode within a year.

**LKQ (Like Kind and Quality)** parts are used components pulled from salvage vehicles. Good for older cars, less ideal for newer ones where mileage and history matter.

Where OEM Matters Most - Safety components: airbags, sensors, crumple zone reinforcements - Structural panels welded into the unibody - Body panels on leased vehicles (the leaseholder may require OEM) - High-end vehicles where resale value is sensitive to repair history

Where Aftermarket Is Reasonable - Cosmetic plastic trim - Headlight and taillight housings on older vehicles - Bumper covers when CAPA-certified - Out-of-warranty work where cost matters more than perfection

What Your Policy Allows Many California auto policies include language requiring OEM parts for vehicles under a certain age. Check your policy or ask your shop to check for you. If OEM is required and the insurer estimates aftermarket, that is a supplement you can win.

The Bottom Line A good shop will tell you honestly which parts they recommend and why. Demand transparency on the estimate — every part should be labeled OEM, A/M, or LKQ.