Jaguar XJ Spare Key
★★★★★ 5-Star Rated — AJ Auto JLR Key Specialist
A Jaguar XJ spare key is one of the most straightforward investments you can make as an XJ owner, and one of the most commonly put off. The XJ is no longer in production. If you are driving it on a single key and that key is lost, damaged, or stops working, you face an all keys lost situation that costs significantly more and takes longer to resolve than adding a spare today while the original is still functioning.
Jaguar XJ Spare Key Cost
The figures below reflect standard service types. All keys lost takes longer and costs more than adding a spare because the vehicle’s key database must be fully cleared before new keys are enrolled. Call 07726 709961 to confirm pricing for your specific model year.
| Service | AJ Auto Price | Main Dealer Estimate |
|---|---|---|
| X351 Smart Key Spare | From £180 | £400 to £800+ |
| X350 / X358 Blade Spare | From £150 | £300 to £600+ |
What Adding a Spare Key Involves
The specialist attends your location with the key hardware appropriate for your XJ generation. Your existing key must be present and working for a spare key addition. The new key is programmed alongside the original through the vehicle’s immobiliser system, and both keys are tested before the specialist leaves.
The process typically takes 20 to 40 minutes for X351 models. Older X350 and X358 variants may be slightly quicker. No workshop visit or vehicle movement is required.
X350, X358 and X351 — What Spare Key Each Generation Needs
The X350 and X358 use a traditional flip-blade remote that must match the original key specification for that vehicle. The X351 uses a modern proximity smart fob and requires the correct hardware for the model year and specification. Confirming your generation before booking ensures the specialist arrives with the correct parts.
What We See in Practice
XJ spare key callouts are predominantly on the X351 platform. The typical owner bought the vehicle privately with one key, drove it for several months, and then called us once they realised the risk they were carrying. In all those cases, the job itself is brief and unremarkable. The cost is considerably lower than the all keys lost situation that a single key owner is one incident away from. For X350 owners, blade wear on the single key is something we check as part of the visit, because a worn blade that is still starting the car today may fail in the lock without warning.
Frequently Asked Questions
Can an XJ spare key be made from just the VIN?
No. A spare key requires the existing working key to be present and the programming to be carried out through the vehicle’s immobiliser module. The VIN identifies the vehicle but does not give access to the security system.
How many keys can be programmed to an XJ?
The XJ supports multiple keys simultaneously. Most owners carry two. The system can hold more, which is useful for households with multiple drivers.
Will adding a spare key affect my existing key?
No. The existing key remains active and unchanged. The spare is added alongside it, and both keys work independently from that point.
Is it worth adding a spare to a high-mileage XJ?
Yes. The key hardware and programming cost does not depend on the vehicle’s mileage, and a high-mileage XJ that is reliable and well-maintained deserves the same key security as any other vehicle.
Book Your Jaguar Key Replacement
Call 07726 709961 or message via WhatsApp for same-day attendance across England and Wales. All work carried out at your location.