Question 1

My key fob shell is cracking or the emergency blade is missing. Can you fix it?

Accepted Answer

Yes. The 2017 XJ fob has an emergency blade tucked inside the housing, and it is more common than you would think for that blade to be missing, uncut, or broken, especially on vehicles that passed through auction or multiple owners. If your shell is cracked or the blade is the only problem, we can cut a new blade from code and swap the internals into a new shell without any reprogramming, because the electronics stay intact. The cut blade gets verified against your door lock on site before we close anything up. If the internal board took damage, we go to a full replacement key and program it the same visit.

Question 2

What actually is a smart key and how does it work on this car?

Accepted Answer

Your 2017 Jaguar XJ uses a proximity-style smart fob. The fob communicates with the vehicle's security system wirelessly, and the car verifies it as an authorized key before it will allow the engine to start. There is also a transponder inside the fob that serves as a backup reader, which matters if the battery dies completely.

The fob has five buttons for lock, unlock, and the remaining functions. Inside the housing is a hidden emergency blade. If your battery goes dead or the proximity system has an issue, that blade lets you get into the car manually through the door lock. On this generation XJ, the door handle conceals the keyhole behind a removable cover or panel, so know where yours is before you need it at midnight.

We can handle any part of this: new shell, new blade cut to your vehicle, full fob replacement, or programming. All of it on site.

Question 3

My Jaguar says the smart key is not recognised. What should I do first?

Accepted Answer

Start with the battery. Pull the CR2032 and put in a fresh one, making sure it sits flat against both contact points. A slightly tilted cell can cause an intermittent read failure that looks like a bigger problem.

If a fresh battery does not clear it, try holding the fob directly against the start button. This activates the passive transponder inside the fob and bypasses the proximity antenna entirely, so you can still start the car even with a weak or partially failed battery.

If the warning is showing on both fobs at the same time, the issue is almost certainly on the vehicle side, not the keys. Owners on Jaguar forums have reported cases where both fobs suddenly showed as unrecognised after the car sat unused for an extended period, pointing toward the vehicle security system losing sync rather than two fobs failing simultaneously. That is a diagnostic job, not a battery swap. Give us a call and we can come to you in the Historic District or wherever the car is sitting.

Question 4

I bought a replacement fob online. Can I just program it myself or have someone with a basic OBD tool do it?

Accepted Answer

Not on this vehicle. The 2017 XJ smart key system requires proper JLR-capable diagnostic equipment to register a new fob. There is no self-programming sequence and no ignition-cycle trick that works here. The fob you bought online is genuinely just a shell and a transponder until someone with the right tooling pairs it to your specific vehicle. A generic or budget OBD programmer is not going to get through this system. If you already have the fob in hand, we can bring the tools to you and finish the job. You buying the fob ahead of time does not complicate anything on our end.

Question 5

What happens if I lose both keys to my 2017 XJ? Is that a harder job?

Accepted Answer

Yes, all-keys-lost is a more involved job than adding a spare while you still have a working fob. When no previously authorized key is present, the process requires security data access and JLR diagnostic tooling capable of performing a full key memory reset and re-registration. The vehicle security system has to be accessed at the module level, the old key records cleared, and the new fobs enrolled from scratch.

It takes longer than a standard spare key job, and not every locksmith carries the equipment for it. I do. If you are in the Oxnard area and you are standing next to a 2017 XJ with no working keys, that is exactly the call to make. Come to you, do it on site, no tow to the dealer required.

2017 Jaguar XJ
Key Replacement - Save vs Dealer in Ventura County

Professional Keys | Honest Pricing

2017 Jaguar XJ
Key Options

Real Savings, Same Quality

2017 Jaguar XJ Smart Key Replacement - Fast, Affordable & Professional

Save vs the Dealer on Your Jaguar XJ Key

Jaguar XJ Rapid Response, Done Right

What Fair Jaguar Pricing Sounds Like

Jaguar XJ Mobile Service FAQ

Jaguar XJ Key Service Areas

Jaguar XJ Key at a Fair Price

2017 Jaguar XJKey Replacement - Save vs Dealer in Ventura County

Professional Keys | Honest Pricing

2017 Jaguar XJKey Options