OEM vs Aftermarket Car Keys: What You Need to Know

The Difference Between Aftermarket and OEM Car Keys

What Do “OEM” and “Aftermarket” Mean

When replacing or programming a new car key or remote, you’ll often hear two terms: OEM and Aftermarket.

They both unlock and start your car — but how they’re made, programmed, and how long they last are very different.

OEM (Original Equipment Manufacturer) Keys

What they are:

OEM keys are made by the same manufacturer that produced your car’s original key when it left the factory.

They match your vehicle’s exact specifications — from the transponder chip and frequency to the housing design.

Key traits:

• 100% compatibility — guaranteed to work with your vehicle’s immobilizer system

• Factory-quality materials and components

• Reliable range, signal strength, and lifespan

• Programmed using OEM-level locksmith or dealer tools

• Usually more expensive due to higher quality and limited supply

Best for:

Drivers who want long-term reliability or own modern or high-end vehicles such as Audi, BMW, or Lexus.

Aftermarket Keys

What they are:

Aftermarket keys are replicas made by third-party manufacturers.

They’re designed to work like OEM versions but are not made by the original automaker.

Key traits:

• More affordable — often 40–70% cheaper than OEM

• Quality can vary depending on the brand

• Programming may be trickier; not every chip or frequency matches perfectly

• Buttons or batteries may wear faster than OEM versions

• Some new vehicles reject low-quality aftermarket keys entirely

Best for:

Backup or spare keys, or older vehicles where cost matters more than premium materials.

OEM vs. Aftermarket — Quick Comparison

Locksmith’s Advice

A professional locksmith often carries both OEM and high-quality aftermarket options.

A good locksmith will:

• Identify your exact chip and frequency

• Recommend only tested, reliable aftermarket brands

• Program and test your key to ensure it performs like OEM

A well-made aftermarket key can perform nearly identical to OEM — the difference is choosing a locksmith who uses the right parts.

Bottom Line

If you want maximum reliability, go OEM.

If you want a practical spare or budget-friendly backup, choose aftermarket — but only from a trusted locksmith who guarantees quality and programming.

Cars & Keys Tip

At Cars & Keys Automotive Locksmith, we stock both verified OEM and premium aftermarket keys — never low-quality clones.

Whether you need a reliable spare or a full OEM-grade replacement, we’ll guide you to the best option and program it on-site for perfect results.