OEM vs Aftermarket vs LKQ Parts: An Operator's Decision Guide

OEM parts come from the original vehicle manufacturer through their authorized parts network and carry the manufacturer's fit, finish, and warranty. Aftermarket parts are produced by third-party manufacturers, sometimes with quality certifications (CAPA, NSF) and sometimes without, and are designed to fit the vehicle but are not built by the original manufacturer. LKQ (Like Kind and Quality) parts are recycled OEM parts pulled from salvage vehicles, sold through dismantlers and parts brokers, that match the original vehicle's specifications. Each category has a defined role in collision repair: OEM is preferred for structural, safety-critical, and visible-finish operations; aftermarket can be appropriate for non-safety-critical bolt-on replacements when properly certified; LKQ is appropriate for body panels, mirrors, and trim where age and condition are matched to the vehicle. The right choice in a given claim depends on the operation, the customer, the carrier, the model year, and state law. Shops that document the reasoning openly avoid most disputes.

Choose OEM when:

• The operation is structural (frame rail, apron, A/B/C pillar, floor pan)
• The part is safety-critical (airbag components, seatbelt anchors, structural welded panels)
• The part is visible and the customer is paying out of pocket on a newer vehicle
• The vehicle is under manufacturer warranty (aftermarket parts can void portions of the warranty)
• The customer or state law specifies OEM
• An OEM repair procedure or position statement requires OEM parts

OEM position statements are public documents from manufacturers. They specify 'must use OEM' for safety systems, structural components, and certain trim. When present, they end the aftermarket conversation.

Aftermarket can work when:

• The part is non-structural and non-safety-critical (bumper covers, grilles, headlamp assemblies on older vehicles, hoods on older vehicles)
• The aftermarket part is CAPA or NSF certified
• The customer has been disclosed and consents in writing
• The carrier has authorized aftermarket as part of the estimate
• The operation does not have an OEM position statement requiring OEM

Uncertified aftermarket parts should be avoided in collision repair. CAPA-certified parts meet CAPA fit, finish, and material standards. NSF-certified parts meet NSF fit, function, and material standards.

LKQ is appropriate when:

• The body panel is not safety-critical (door, fender, hood on a non-newer vehicle)
• The mileage and condition of the donor part match the customer's vehicle
• The customer has been disclosed and consents
• The carrier has authorized LKQ in the estimate

LKQ parts vary by donor vehicle's age and condition, mileage of the donor part, visible cosmetic condition, and whether the part has been previously damaged or repaired. The shop should inspect every LKQ part before installation.

A growing number of states have passed laws that give consumers the right to OEM parts under certain conditions:

• Newer-vehicle OEM rights: several states require OEM parts on vehicles under a model-year cap (commonly 24-48 months) unless the customer specifically authorizes aftermarket in writing
• Disclosure requirements: most states require the shop to disclose the use of aftermarket or LKQ parts on the estimate and on the final invoice
• Customer consent: many states require explicit customer signature consenting to non-OEM parts

The specifics vary. Verify the customer's state law before the parts decision. Failing to disclose non-OEM parts is one of the fastest ways for a shop to face a regulatory complaint.

Carriers sometimes push aftermarket parts on operations where OEM is required by procedure or position statement. The shop's response:

1. Cite the OEM position statement (manufacturer-published) that requires OEM for that operation
2. Cite the OEM repair procedure document number
3. Quote the language: 'OEM parts required for proper repair of the [system]'
4. Provide the customer with the position statement and ask for written authorization if aftermarket is going to be used

When present, an OEM position statement ends the aftermarket conversation in the supplement file.

The right script for the front desk: 'Your insurance company's estimate calls for [OEM / aftermarket / LKQ] parts on the [parts list]. Here is what each means: [brief explanation]. State law gives you the right to request OEM parts, but if you choose OEM where the carrier authorized aftermarket or LKQ, you may be responsible for the price difference. We recommend OEM for [list of specific items], and we are comfortable with [aftermarket / LKQ] for [list of specific items]. Here is the disclosure form-please review and sign.' This conversation is required by law in many states. Doing it well is the difference between a comeback complaint and a satisfied customer.

For each part on the estimate:

1. Is the operation structural or safety-critical? Use OEM.
2. Is there an OEM position statement requiring OEM? Use OEM.
3. Is the vehicle within state OEM-rights window? Use OEM unless customer signs aftermarket consent.
4. Did the carrier authorize aftermarket or LKQ? Use the carrier-authorized category if it has CAPA/NSF certification or is OEM-recycled in good condition.
5. Is the carrier-authorized aftermarket uncertified? Push back to carrier; request OEM or certified aftermarket.

Shops that record the parts category, certification, vendor, and customer signature for every parts decision can settle parts disputes after vehicle delivery from the file itself, because it already contains the answer to any future question.