In the late 1990s car manufacturers started equipping vehicles with programmed transponder keys and engine immobilizers, which was a big improvement for vehicle security. These systems use a small transponder chip inside the key that communicates with the car’s computer. If the chip is missing or incorrect, the engine won’t start—even if the key turns in the ignition. However, not all vehicles have this technology. These chipped security keys can be the difference between a thief starting your car with simple methods (like shaved keys, hotwiring, or even a screwdriver), and needing advanced technology and knowledge to start your car without its’ key. So how can you tell whether your car uses a chipped key or just a plain metal key? *This article does not apply to proximity keys (push-to-start cars).*
Here are a few ways to identify the difference:
1. Check the Key’s Appearance
- Chipped/Programmed Key: Often has a plastic head that’s thicker than usual. This plastic casing usually contains the transponder chip.
- Metal Key: Typically a solid metal key with no plastic head or electronics inside, but can sometimes have a smaller plastic head and be difficult to identify.
2. Look for a Security Indicator on the Dashboard
Most vehicles with immobilizers have a security warning light on the dashboard. This light may appear as:
- A car with a key icon
- A padlock symbol
- A blinking light when the car is off
- Red blinking “SECURITY” light
If you see this light blinking when the key is removed, your car likely uses a transponder key system.
3. Check the Owner’s Manual
Your vehicle’s manual often has a section describing the key and ignition system. Look for terms like:
- “Transponder”
- “Security chip”
- “Engine immobilizer”
4. Try Starting the Car with a Copy
If you’ve had a copy made at a hardware store:
- If it starts: It’s likely a plain metal key.
- If it doesn’t: You probably need a chipped key, which hardware stores often can’t duplicate properly without programming.
5. Consult a Locksmith or Dealer
A professional locksmith or dealership can scan your key to check for a transponder chip. They can also identify the system type based on your vehicle’s year, make, and model.
More Examples:
Starting in the 1990’s and throughout the 2000’s many auto manufacturers were using both types of keys in different vehicles. As years went on non-transponder keys became less common. Here are some examples:
