These instructions apply to the Jaguar XE Mk1 (X760) 2015-Present.
For other models, please choose your vehicle here.
The Jaguar XE (X760, 2015–present) uses the same keyless smart key as its Land Rover cousins, distinguished by a chrome slider end-cap that hides the emergency blade. Most owners forget the fob has a battery at all — until the XE stops sensing the key as they walk up, or the driver display shows a low smart-key-battery warning. That flat coin cell, not the car’s keyless module, is nearly always the cause, and the fix is a five-minute job once you know the chrome cap is the way in. Below is the exact battery the XE takes, how to open the case cleanly, and why a replacement key still has to come from a Jaguar dealer.
How to Tell the Fob Battery Is Dying
- Range drops right off. The XE no longer recognises the key from a stride away; you end up pressing the fob to the door handle to lock or unlock. Shrinking range is the earliest symptom.
- A low smart-key-battery message. The X760 cluster warns you when the fob voltage falls — treat it as a prompt to change the cell within a few days, not something to ride out.
- Keyless start becomes fussy. The engine may not fire on the first press, or you have to hold the fob near the start button or column before the car acknowledges it.
- Cold mornings finish it off. A weak cell loses more voltage in the cold, so an intermittent fob often dies completely on the first frosty day.
A CR2032 in an XE fob generally lasts two to four years. Because the fob is always answering the car, leaving it right next to the parked XE overnight drains it faster than carrying it around does.
The Battery You Need
The Jaguar XE smart key runs on one CR2032 — a 3-volt lithium coin cell, 20 mm across and 3.2 mm thick. It is a shelf-standard battery available in any supermarket, hardware shop or phone shop. Fit a fresh, good-quality branded cell and steer clear of the thinner CR2025; it looks almost the same but its reduced thickness can leave it loose against the terminals and giving poor range even when new. Handle the replacement by its edge only, keeping fingers off the flat faces so no residue reaches the contacts.
Method — Keyless Smart Fob
- Slide the chrome cap and free the blade. Move the chrome end-cap of the fob to reveal the metal emergency key blade, then pull the blade out of its channel.
- Separate the case with the blade. Slot the tip of the emergency blade — or a slim plastic tool — into the gap the blade left and gently lever the two halves of the fob body apart. They part with light pressure and there are no screws.
- Remove the old cell, noting how it sits. In the XE fob the CR2032 seats positive (+) face up, so the printed side faces you as you look into the open case. Check the old cell’s orientation first.
- Fit the new battery and reassemble. Press the fresh CR2032 in under its clip the same way round, click the two halves back together until the seam sits flush, reinsert the emergency blade, and slide the chrome cap back on until it clicks.
⚠️ Get the polarity right. A CR2032 fitted upside down can bridge the holder the wrong way and quietly discharge, leaving you with a “new” battery that is already flat. Match the orientation of the cell you removed — positive side up on this fob.
Confirm It Worked
Step back a few metres and lock, then unlock, the XE with the fob; full keyless range should return at once. Get in and press start — the car should recognise the fob immediately. The low smart-key-battery message clears once the car reads a healthy fob, which can take one drive cycle rather than clearing the second you snap the case shut.
If a Fresh Cell Doesn’t Fix It
- Re-check orientation and seating. A cell in upside down or not fully clipped under its tab is the usual reason a new battery seems not to help.
- Clean the contacts. Wipe the terminals and the battery faces with a dry cloth to shift grease or light corrosion that causes dropouts.
- Use the backup start. If the fob is genuinely dead, hold it against the marked point on the steering column and press start with the brake down — that shows the immobiliser is fine and only the fob is at fault.
- Check the car’s 12 V battery. A run-down vehicle battery can make the keyless system sluggish and imitate a fob fault; if the XE is slow to wake generally, look at that as well.
New Key or Spare — Why It’s a Dealer Job
Swapping the cell leaves the fob’s coding untouched, so there is nothing to reprogram — the key just keeps working. A new key is a different task: the XE’s immobiliser and keyless-vehicle module have to be reached with Jaguar-approved diagnostic equipment, and blank fobs are ordered against the car’s VIN and security profile. That puts a spare or a lost-key replacement firmly with a Jaguar dealer or a specialist auto-locksmith. Keeping the second fob’s battery fresh is the cheapest way to make sure you are never down to a single working key.
Frequently Asked Questions
What battery does a Jaguar XE key fob take?
A single CR2032 3-volt lithium coin cell — the same battery Jaguar and Land Rover share across their current smart keys. The XE has one button-fob type, so there’s no size to second-guess.
Which way up does the cell go in an XE fob?
Positive (+) side up, with the “CR2032” marking facing you in the open case. Note the old cell’s orientation before you remove it and copy it.
Do I need to reprogram the key after changing the battery?
No. Replacing the coin cell doesn’t affect the pairing, so the fob reconnects to the car by itself the next time it’s used. Programming is only needed for a genuinely new key.
How long does an XE fob battery last?
Typically two to four years. Leaving the fob right by the car keeps it waking to answer the vehicle and runs the cell down sooner.
The new battery didn’t fix my XE key — what next?
Re-check that the cell is the right way up and clipped firmly in, then clean the contacts. If it still won’t respond, get in with the emergency blade and start the car by holding the fob to the column; if that works, the fob’s transmitter has likely failed and needs replacing.
Can I drive the XE if the fob battery is flat?
Yes. Slide the chrome cap and pull out the emergency blade to unlock the door, then hold the fob against the marked point by the steering column and press start with your foot on the brake. A dead coin cell won’t leave you stranded.
If the remote quit abruptly — for instance right after the 12 V battery was disconnected, rather than fading gradually — the trouble may lie in the car’s electronics rather than the fob, and any stored fault code will help pin it down. You can decode what a logged code means over at autodtcs.com.
Independent guide — not affiliated with Jaguar. Always follow your official service manual and safety precautions. Read our full disclaimer.