How can you tell if an aftermarket car key is an OEM?

Replacement keys are essential when you've lost your car key or need a spare. However, it's easy to end up with an aftermarket key instead of an OEM (Original Equipment Manufacturer) key. An OEM key comes directly from the car manufacturer, ensuring compatibility and quality, while an aftermarket key is produced by third-party companies and may vary in quality and functionality. This guide will help you spot the difference between OEM and aftermarket car keys.

1. Inspect the Branding and Logos

OEM keys are designed by the car manufacturer and often carry branding, such as logos and part numbers. Here's what to look for:

Manufacturer’s Logo: OEM keys often include the car manufacturer's logo. Aftermarket keys may not have logos or may display subtle differences if they do.

Part Numbers: OEM keys usually have a serial or part number, which should match the specific key model for your vehicle. This can often be cross-referenced in the car's user manual or with the dealership.

Aftermarket keys may lack logos or carry generic labels like "transponder key" or “key fob.”

2. Check the Key's Build Quality

An OEM key typically has superior materials and a more durable construction. Here are a few factors to consider:

Material: OEM keys generally feel more substantial and are crafted from high-quality plastic and metal. Aftermarket keys can feel lighter and are often made from cheaper materials.

Finish: OEM keys often have a smooth, refined finish. In contrast, aftermarket keys might have rough edges, inconsistent molding, or slight differences in color.

3. Compare the Key Design and Shape

OEM keys are manufactured to exact specifications. Here’s what to look for:

Button Layout: For a fob or remote key, OEM keys will have a button layout that matches your vehicle exactly. Aftermarket keys may have a similar design but might place buttons in slightly different positions.

Key Blade Shape: The key blade of an OEM key is precisely cut to match your vehicle’s lock. An aftermarket key may not fit as well in the ignition or lock, causing difficulty in turning the key or engaging the lock mechanism.

4. Test the Key’s Compatibility and Functionality

Using the key is a definitive way to assess its authenticity:

Lock and Unlock Test: OEM keys are usually smoother in operation and work with all locks. If the aftermarket key is difficult to turn or fails to lock/unlock the doors consistently, it may not be OEM.

Ignition Functionality: OEM keys are usually reliable when turning on the ignition, while aftermarket keys may exhibit issues such as delay or require extra effort to turn.

5. Assess the Key Programming and Transponder Compatibility

Modern car keys often include transponders or keyless entry systems. OEM keys come programmed to your car’s security system. Here’s how to check:

Compatibility with Programming: If you’ve purchased the key and it fails to program, it may be aftermarket. Some aftermarket keys use cheaper chips that aren’t fully compatible with all car systems.

Range and Response Time: For remote functions, OEM keys have a faster and more reliable response. An aftermarket key may have a limited range, requiring you to be closer to the vehicle for functions to work.

6. Verify with Your Dealership

When in doubt, your dealership can verify a key’s authenticity. By cross-checking the part number, they can tell if the key you’ve purchased matches your vehicle's OEM specifications.

7. Price Comparison

OEM keys are generally more expensive than aftermarket options due to their quality and compatibility. If a replacement key seems unusually cheap, it’s more likely an aftermarket key.

Conclusion

Understanding the differences between an OEM and an aftermarket key can help you avoid costly mistakes and ensure smooth functionality. By following these steps and doing a bit of research, you can confidently identify if your key is truly OEM.