Yes. The 2006 Ford Expedition uses a transponder chip in the ignition key as part of Ford's Passive Anti-Theft System (PATS).
Beyond that, the article explains how the chip works, how to tell if your key contains a transponder, and what to do if you need a replacement key for a vehicle equipped with PATS.
Key technology in the 2006 Expedition
By the mid-2000s, Ford equipped Expeditions with an immobilizer that requires a coded transponder in the ignition key. When you turn the key, the car's computer validates the transponder's unique code. If the code is recognized, the engine starts; if not, the immobilizer prevents starting. This system is designed to deter theft and is standard on most Expeditions from that era.
How the immobilizer works
The key contains a small transponder chip embedded in the plastic head. The ignition lock and the car's immobilizer module communicate via radio frequency and verify the chip's code. If the code matches the vehicle's stored data, the ignition circuit is unlocked and the engine can start.
Key types and how to tell if your key has a chip
Use this guide to understand whether your ignition key includes a transponder and how that affects starting and replacement options.
- Most 2006 Expedition ignition keys include a transponder chip inside the plastic head; the chip is not visible but is required for starting.
- Many keys also include a remote fob for doors; the presence of a remote does not guarantee a chip, but combined keys for this model typically include one.
- Non-transponder (no chip) keys exist in some vehicles, but a PATS-equipped Expedition will not start with a key lacking the transponder.
- If you're unsure, a Ford dealer or a licensed automotive locksmith can verify whether a key is chipped for your VIN.
In short, a 2006 Expedition's starting system relies on the transponder chip in the key, so any replacement key must include a programmable transponder.
What to do if you need a replacement key
Because the Expedition uses PATS, new or replacement keys generally must be cut to fit the metal blade and programmed to the vehicle's immobilizer. This work is typically performed by a Ford dealer or a licensed automotive locksmith with PATS programming capability.
Before attempting replacement, gather information and documentation to speed up service.
Steps to obtain and program a replacement key (typical process):
- Provide proof of ownership (title/registration) and the vehicle VIN to the dealer or locksmith.
- Determine whether you already have a working programmed key that can assist in programming the new key, if applicable to your vehicle.
- Arrange for a replacement key that includes a transponder chip and have it cut to match the ignition key blade.
- Have the new key programmed to the vehicle’s immobilizer; do not attempt DIY programming without the proper equipment.
- Test the new key by starting the engine and ensuring the immobilizer recognizes it correctly.
Note that programming requirements and costs vary by dealer, locksmith, and location. Some vehicles support adding multiple keys in a single visit, while others require separate programming sessions.
Summary
For a 2006 Ford Expedition, the ignition key normally contains a transponder chip that is read by Ford's PATS immobilizer. If you need a replacement, you should plan to obtain a chipped key that is cut to match your ignition blade and programmed to your vehicle by an authorized dealer or qualified locksmith. This ensures the immobilizer recognizes the key and your vehicle will start reliably.