# What is aftermarket parts?

> Aftermarket parts are replacement vehicle parts made by a company other than the original vehicle manufacturer.

Glossary date: July 27, 2026.

## How it works

They may be new and designed for the same application as an OEM part. Policy provisions, state rules, certification, and availability influence their use in repairs.

## Example

A body shop estimate lists a new replacement fender made by an independent parts manufacturer.

## Why it matters

The label alone does not describe the part's certification, warranty, fit, or repair suitability.

## What to check on your policy

Ask who made the part, whether it is certified, what warranty applies, and how to raise a fit or quality concern.

Coverage, definitions, limits, and legal requirements vary by policy and state. Your declarations page and policy forms control your coverage.

## Related terms

- [OEM parts](https://locations.goautoinsurance.com/car-insurance-glossary/oem-parts.md)
- [Policy endorsement](https://locations.goautoinsurance.com/car-insurance-glossary/policy-endorsement.md)

- [Car insurance guide](https://locations.goautoinsurance.com/car-insurance-guide.md)
- [Complete glossary](https://locations.goautoinsurance.com/car-insurance-glossary.md)