Is It Worth Getting A Spare Car Key?
A spare is the one piece of key work you can plan, price and book calmly. Every other kind happens on the worst possible day.
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Yes, for most owners — and the saving is larger than people expect
Adding a spare while you still hold a working key is the simplest key job there is. Replacing a key when none remains means opening the vehicle, establishing the key data and rebuilding the key set from nothing. The same vehicle, a week apart, can be two very different jobs at two very different prices.
What Actually Changes When The Last Key Goes
A working key is proof of access, and the vehicle treats it that way. Without one, every step has to be earned.
With a key in hand, the car can usually be put into a state where it will accept an additional key relatively quickly. The existing key does a lot of the work for us.
With no key at all, we start from the outside. The vehicle has to be opened without damage, the correct blade profile has to be established, and key data has to be written so the immobiliser accepts something it has never met. Some vehicles also impose a security delay during that process, which is time nobody can shorten.
That is the whole argument for a spare: it is the same destination reached by a much shorter road.
Who Benefits Most From A Second Key
Some owners are running a bigger risk than they realise.
Used-car buyers given one key
A large share of used cars change hands with a single key. If you have just bought one, you are one dropped key away from the expensive version of this job.
Van drivers and trades
A van off the road is lost income. A spare kept at home or in the office turns a lost key into an inconvenience rather than a day written off.
Households sharing one car
Two drivers passing one key between them means twice the chances of it going missing, and no fallback when it does.
Owners of ageing keys
Worn buttons, a cracked case or a blade that has rounded off are all signs the only key is near the end of its life. Cloning or adding a second key before it fails is far easier than after.
Planned Spare Versus Emergency Replacement
The same vehicle, the same key type, two entirely different jobs.
| Spare while a key works | All keys lost | |
|---|---|---|
| Vehicle entry | Not required | Non-destructive entry required |
| Key data | Taken from the working key or the vehicle | Established from the vehicle itself |
| Typical effort | Straightforward | Longer, with possible security delays |
| Your day | Booked at a time that suits you | Unplanned, usually urgent |
| Relative cost | The cheapest key work available | The most expensive key work |
Where To Keep It, And Where Not To
A spare hidden in the vehicle is not a spare — it is a gift to anyone who finds it.
Keep it somewhere away from the car: at home, with a partner, or with someone nearby you trust. Never leave it in the glovebox, under a wheel arch or in a magnetic box under the sill.
If your car uses a keyless proximity key, keep both keys away from the front door and away from windows, and consider a signal-blocking pouch. Relay attacks work by picking up the key's signal from inside the house, and a second key left in the hallway is a second opportunity.
It is also worth using the spare occasionally. Keys that sit unused for years can end up with a flat battery, and finding that out in an emergency defeats the point of having one.
Can Any Vehicle Have A Spare Added?
Most can, but a few recent models limit key creation to the franchise network, and some vehicles cap the number of keys they will hold.
Before we quote, we check what your specific vehicle allows. Some cars have a maximum number of keys they will accept, and on those, adding one may mean removing an old key from the system — which is worth doing anyway if a previous key was lost.
If your vehicle turns out to be one of the small number that remains dealer-only, we will tell you rather than take the booking.
The Used-Car Handover Nobody Questions
One key is handed over with the V5C and the service book, and almost nobody asks where the second one went.
It matters for two reasons. The obvious one is that you are now a single mislaid key away from the most expensive version of this job. The less obvious one is security: if a previous owner, a previous driver or a former household still holds a working key, that key will start your car until it is removed from the vehicle's system.
Both are solved at the same visit. A second key is added, and where the vehicle allows it, any keys it still recognises but you do not hold can be removed. It is worth asking for explicitly, because it is not automatic.
If you are viewing a used car rather than already owning one, ask how many keys come with it and treat a single key as a negotiating point. It is a real cost, and sellers know it.
Looking After The Keys You Have
A spare only helps if both keys stay in working order. These four habits prevent most of the failures we attend.
Do not carry it as a keyring anchor
A heavy bunch hanging from the ignition wears the barrel over years and puts leverage on the key blade. Keep the car key on a light ring of its own.
Keep it out of water
Washing machines, coat pockets in heavy rain and poolside lockers account for a large share of dead fobs. Corrosion inside a key is often not recoverable.
Change the battery before it dies
Reduced range is the warning. A coin cell is trivially cheap and takes minutes, and it prevents an avoidable roadside problem.
Rotate the spare occasionally
Use it once in a while so you know it works and its battery is alive. A spare discovered to be flat during an emergency is not a spare.
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