There is a rule buried in the owner's manual of most Fords built between 1998 and 2011 that decides what a spare key costs you, and almost nobody knows it until the day they need a key. It is this: with two working keys you can often add a third yourself. With one, you cannot. Call or text (817) 214-2934 and count your keys before you do anything else.
Quick Answer
As of September 2026, adding a key to a 1998–2011 Ford, Lincoln or Mercury with PATS costs $100–$300 when the vehicle has two working keys and the onboard procedure applies, and $150–$350 when only one key exists or all keys are lost, because the job then needs a diagnostic tool and often a timed security wait. The single biggest thing you can do to control that cost is to make the second key before you are down to one. On these vehicles the two-key rule is not a locksmith policy — it is built into the anti-theft system by Ford.
What PATS Actually Is
PATS stands for Passive Anti-Theft System. Ford began fitting it in the mid-1990s and it had spread across most of the line by the early 2000s, covering the vehicles you see everywhere in Hood County: F-150, Super Duty F-250 and F-350, Expedition, Explorer, Ranger, Escape, Mustang, Crown Victoria, Taurus, the E-Series vans, and the Lincoln and Mercury equivalents.
"Passive" means you do nothing to arm it. There is no button and no fob required. A transponder chip sits in the head of the key; an antenna ring around the ignition lock energises that chip when you insert the key; the chip answers with a code; a module decides whether that code is on its list. If the answer is wrong or absent, the fuel and spark are cut and the engine starts, catches for half a second, and dies.
Which module makes that decision changed over the years. On earlier PATS vehicles it is a standalone unit; on many mid-2000s and later ones the function lives in the instrument cluster; on some it sits with the powertrain control module. You do not need to know which yours is, but a locksmith does, because it determines the route into the system and therefore the price.
The transponder in the key is passive too — no battery in it. That is why a Ford of this era whose remote buttons have long since died will still start perfectly well, and it is a genuinely useful thing to know before you conclude your key has failed.
The Two-Key Rule, Stated Plainly
On many PATS vehicles of this era, Ford provided an owner-accessible way to add a key: insert an already-programmed key, turn to run, turn off, insert the second already-programmed key, turn to run, turn off, then insert the new key within a set window and turn to run. The theft light acknowledges, and the third key is accepted.
That procedure requires two keys that the vehicle already trusts. Not one. Two.
With one working key, the owner-accessible route is closed. The job then requires a diagnostic tool that can access the PATS module directly, and on many of these vehicles it also requires a deliberate security waiting period — commonly around ten minutes, sometimes repeated — before the module will accept new keys. That wait is designed in. It exists precisely so that somebody who has broken into a vehicle cannot program a key to it in thirty seconds.
Two practical consequences follow, and they are the whole point of this article:
If you currently have two working keys, a third is cheap. It is a cut and a short procedure.
If you are down to one, you are one bad afternoon away from the expensive version. And the moment you have none, you are in the all-keys-lost band with a security wait attached.
The exact procedure and whether it applies varies by model and by year within a model — a 2003 and a 2008 wearing the same badge can be different. The VIN settles it, which is why we ask for it rather than guessing from the outside.
Granbury Pricing for PATS-Era Fords
| Job | Typical Granbury range (September 2026) | Notes |
|---|---|---|
| Add a key, two working keys already present | $100–$300 | The cheapest version; cut plus onboard procedure |
| Add a key, only one working key | $150–$350 | Needs tool access; security wait on many models |
| All keys lost | $150–$350 | Decode or cut to code, then tool relearn plus wait |
| Integrated keyhead transmitter (key with remote built in) | $150–$400 | Later years; the remote side adds part cost |
| Separate remote fob programmed alongside a key | $80–$350 | Often bundled cheaper into the same visit |
| Ignition lock cylinder repair or replacement | $100–$350 | Common on high-mileage trucks of this age |
| Second key made at the same visit | Lower than a separate call-out | One trip charge instead of two |
These bands are the ones published across this site, including on our Ford key replacement page and our car key programming page. We quote the all-in figure for your VIN before starting.
The dealer comparison on a truck this age is usually not close, and not mainly because of the labour rate. A vehicle with no working key has to reach the dealer's floor, which from Tolar or Lipan means a trailer. Mobile service removes that line item entirely.
What the Theft Light Is Telling You
The little car-and-key symbol on the dash is the most useful diagnostic instrument on a PATS Ford, and most owners have never been told how to read it.
A brief flash at key-on, then out. Normal. The system recognised the key and disarmed.
Rapid, continuous flashing, engine cranks but will not run. The system did not accept the key. Either the key is not on the list, the chip has failed, or the antenna ring around the ignition is not reading it.
A steady light, or no light at all, on a vehicle that will not start. Points at the module or the wiring rather than the key. Worth knowing, because no amount of new keys fixes it.
Starts, runs for a second, then dies — every time. The signature PATS refusal. The engine fires on residual fuel and then gets shut down. If your Ford of this era does exactly that, the anti-theft system is the first suspect and the starter, battery and fuel pump are not.
One more that catches people: a truck that has started fine for years and suddenly refuses, intermittently at first, usually has an antenna-ring or wiring fault rather than a failed chip. On a vehicle two decades old, the wiring loom around the ignition has had a long time to chafe. That is a repair, not a key purchase.
Why These Trucks Specifically Get Expensive
Hood County is full of 1998–2011 Fords that are still working vehicles — ranch trucks, tow rigs, second vehicles for hauling. Three things about that population drive cost.
They have had long lives and lost keys along the way. A twenty-year-old truck that has had four owners is very likely down to one key, and nobody has ever checked.
The ignition cylinders are worn. Two decades of a heavy keyring hanging off the ignition wears the wafers oval. The symptom is a key you have to jiggle, lift, or hold at an angle. Cut a fresh, dimensionally correct key for a worn cylinder and it may not turn at all, which feels like a bad key and is actually a tired lock. That is why we assess the cylinder before cutting on any high-mileage truck — the same issue we cover in our Ford Super Duty ignition repair guide.
Keys and remotes were often separate. For much of this era the transponder key and the remote were two objects on the same ring. Later years merged them into one integrated keyhead transmitter. Which you have changes the part and therefore the price, and it is not always obvious from looking at it.
Where This Year Band Sits
This is the middle chapter of three, and knowing which one you are in tells you most of what you need.
Before PATS — roughly pre-1996 on most models. No chip, no immobilizer, no programming. A key is metal and a cut, and it is the cheapest key work there is. That era is covered in our 1980–1996 Ford F-150 and Bronco key guide.
PATS, 1998–2011 — this article. Chip in the key, antenna at the ignition, two-key onboard rule, timed relearn when you are short of keys.
After, roughly 2012 onward. Increasingly proximity fobs and push-button start, module-level security, and prices that track the electronics rather than the cutting. Our 2015–2020 F-150 spare key guide covers what that looks like on the modern trucks.
Ford was not unusual in any of this. Every manufacturer walked the same path from mechanical key to chip to module-held security, which is why a General Motors truck of similar vintage behaves comparably — the mechanics differ but the logic does not, as our Chevy Silverado transponder and remote-start write-up shows, and why immobilizer work on any make comes down to the same question of what the module currently trusts, as in our immobilizer module programming guide.
Can You Do the Onboard Procedure Yourself?
If you genuinely have two working keys, often yes, and we will tell you so on the phone.
We would rather say "your owner's manual has this procedure, try it before paying anyone" than take a call-out fee for something you can do in your driveway in five minutes. The catch is that you need the third key in hand, correctly cut to your locks, with a chip that is compatible with your vehicle and not already paired elsewhere — and getting that part right is where the do-it-yourself route usually fails.
So the split that works is: we cut and supply the correct blank, you run the procedure if your vehicle supports it. If it does not take, we have the tool.
Where it definitely will not work: with one key, with no keys, with a key bought on the wrong chip generation, or on a model year where Ford did not provide the onboard route. The chip side of that is worth understanding in general terms before you buy anything — our transponder key guide for Granbury covers what the chip is actually doing.
What We Need Before We Come Out
- The VIN — this matters more on PATS vehicles than almost anywhere else
- Year, model, and trim
- How many keys currently start the vehicle. Not how many keys exist. How many start it.
- Whether the key has a remote built into the head or the remote is separate
- What the theft light does when you turn the key
- Whether the key has to be jiggled or held to turn
Proof of ownership is required on any job where a key is made: registration, title, or insurance in your name alongside photo ID. Texas locksmiths are licensed through the Department of Public Safety Private Security Program, and it is a fair question to ask on any doorstep — as is asking for a firm price before work starts, which is the subject of our guide to vetting a locksmith in Granbury.
How the Job Runs
Most PATS jobs in Granbury take thirty minutes to an hour and a half, and the variable is the security wait rather than the work.
We confirm the VIN and identify which PATS generation and module the vehicle uses. We cut the key — by code from the VIN where available, or by decoding the door lock where the code is no longer obtainable, which on a vehicle this old is common. Then either the onboard procedure runs, or we connect to the diagnostic port and write the key directly, sitting through the timed security wait if the platform imposes one.
Then we test: start on every key you hold, remote functions if fitted, and the doors and tailgate. If the ignition cylinder is worn badly enough that a correct key struggles, we tell you then rather than leaving you with a key that works today and not next winter.
On an all-keys-lost job we also ask whether you want the old keys erased. On a truck that has been through several owners, someone out there may still have one, and clearing the list is straightforward while we are already connected — see our guide to rekeying and erasing keys on a used vehicle for what that involves.
The One Habit That Saves the Most Money Here
Count your working keys today, and if the answer is one, make the second one this month.
That is the entire lesson of the two-key rule. On these Fords the gap between "I have two keys and want a third" and "I have one key and need another" is real money and a security wait, and the gap between one key and none is larger again. Nobody has ever regretted making a spare for a twenty-year-old truck; a lot of people have stood in a pasture regretting the opposite.
Do it during a visit you are already paying for and the second key costs a fraction of what a separate call-out to Lipan or Bluff Dale would.
Frequently Asked Questions
Why does my Ford need two working keys to program a third? Because Ford designed it that way. The owner-accessible onboard procedure on many 1998–2011 PATS vehicles requires two keys the vehicle already trusts before it will accept a new one. With one key, that route is closed and the job needs a diagnostic tool, and often a timed security wait.
How much is a spare key for a 2005 F-150 in Granbury? As of September 2026, $100–$300 if two working keys exist, and $150–$350 if only one does or all are lost. The difference is the programming route, not the key itself. Send the VIN and how many keys currently start it and we will give you a firm figure.
My theft light flashes and the engine starts then dies. What is wrong? That is the classic PATS refusal — the engine fires on residual fuel and the system cuts it. Either the key is not accepted, the chip has failed, or the antenna ring at the ignition is not reading it. It is not the starter, the battery, or the fuel pump.
Can I program a Ford key myself? If your vehicle supports the onboard procedure and you genuinely have two working keys, often yes, and we will tell you so rather than charge you. You still need a correctly cut key on a compatible chip that has not been paired to another vehicle, which is the part that usually goes wrong.
Do I need the dealer for an all-keys-lost Ford of this era? Generally no. These are among the most routine all-keys-lost jobs an automotive locksmith does. The practical advantage of mobile service is larger here than the price difference, because a truck with no key would otherwise need transporting to the dealer's floor.
My remote buttons stopped working but the truck still starts. Why? Because the remote and the transponder are separate systems. The remote is a powered radio transmitter and the transponder chip is passive, so a dead battery or a failed remote board has no effect on starting. On many of these Fords the two were separate objects to begin with.
The key has to be wiggled to turn. Is that the key or the ignition? Usually the ignition. Twenty years of a heavy keyring wears the cylinder oval, and a fresh, correctly cut key can then fit worse than the worn one. Cylinder work runs $100–$350 and is worth assessing before new keys are cut.
Do you come to the vehicle? Yes. We cover Granbury, Acton, DeCordova, Pecan Plantation, Tolar, Lipan, Cresson, Nemo, Bluff Dale, Glen Rose, and roughly 25 miles out. A truck that will not start is exactly the job mobile service exists for.
Count Your Keys, Then Call
Send us the VIN, the model year, and how many keys currently start the truck, and you will get a real number rather than a range. Call or text (817) 214-2934, weekdays 8:00 AM to 7:00 PM, Saturdays 8:00 AM to 5:00 PM, with 24/7 emergency availability. You can also request service through our contact page or read our all-keys-lost guide for the Ford Bronco and Ranger.
Sources
- Texas Department of Public Safety — Private Security Program
- National Automotive Service Task Force — Vehicle Security Professional Program
- National Highway Traffic Safety Administration — vehicle safety and recalls
- National Insurance Crime Bureau — vehicle theft resources
- Texas Department of Motor Vehicles — vehicle registration and title
- Associated Locksmiths of America