Spare Transponder Keyscut & coded in Chinnor.
Transponder keys need programming, not just cutting. We cut the blade and code the chip to your immobiliser at your vehicle, so your spare turns the lock and starts the engine first time.
~40 min
Typical lockout arrival
DBS & insured
£10m via Locksure
Mobile
We come to your vehicle
Service overview
Spare Transponder Keys: what it is and when you need it
What it is
A transponder key has a small chip in the head that sends a code to your car's immobiliser. If the code isn't recognised, the engine won't start, even if the blade turns in the ignition. We supply the right transponder key, cut the blade and program the chip to your car.
Who it's for
Owners of most cars and vans built since the late 1990s that use a key in the ignition, including many older vehicles without remote buttons. It's ideal if you have one working key and want a reliable backup.
When you need it
When you only have one key, when your current key is cracked or worn, or when a copy made elsewhere opens the door but won't start the car; a classic sign the chip was never programmed.
Why use a professional
Programming a transponder chip requires diagnostic equipment and the correct procedure for your make and model. Get it wrong and you can waste money on a key that never works. We do it right, on site, and test it before we leave.
Don't leave it
What happens if you put it off
A transponder key that isn't programmed properly is just a piece of metal. Relying on a single chipped key carries real risk.
If it's ignored
- Lose your only transponder key and the car becomes an all-keys-lost job.
- A worn or cracked key head can damage the chip inside.
- Your car may refuse to start at the worst possible moment.
Risks and rising costs
- All-keys-lost replacements usually take longer and cost more than a spare.
- A failing chip can cause intermittent no-start problems.
- Being left stranded can mean recovery and taxi costs.
Common mistakes
- Having only the blade cut at a key shop, without the chip programmed.
- Buying a blank online that uses the wrong transponder type.
- Taping up a broken key head instead of replacing it.
Our process
How the job is done, step by step
01
Identify your key
Your registration and a photo of your key tell us which transponder type your car uses.
02
Free quote
A clear price for your vehicle and the key option you prefer.
03
Visit your vehicle
We come to your home or workplace at a time that suits you.
04
Cut and code
We cut the blade precisely and program the chip to your immobiliser.
05
Start-up test
We start the car with both keys to prove they work before we leave.
Why it's worth it
What you get
Starts first time
Properly programmed chips mean no guesswork at the ignition.
Cost saving
A spare now avoids a more involved all-keys-lost job later.
Done on site
No dealer appointment or waiting around for your car.
Right key, first time
We match the correct transponder type for your make and model.
Clear options
Aftermarket, OEM unbranded or genuine branded keys where available.
Trusted
DBS checked, £10m public liability cover and MALA-acknowledged training.
In detail
Spare Transponder Keys explained
Transponder systems differ between manufacturers and model years. Here's what matters.
How a transponder works
When you turn the key, the car's immobiliser sends a signal to the chip. The chip replies with a code. If the code matches, the engine is allowed to start. Without that handshake, the car stays immobilised.
Fixed and encrypted chips
Older systems use simpler fixed-code chips, while newer ones use encrypted or rolling codes for greater security. Encrypted chips need more advanced equipment to program, which is why the right tools matter.
Blade types
Transponder keys can have traditional edge-cut blades or high-security laser-cut blades. We cut both precisely to your existing key or the vehicle's lock data.
Onboard and diagnostic programming
Some vehicles allow programming through an onboard procedure; others require diagnostic equipment plugged into the car. We use whichever is right for your vehicle.
Cars, vans and fleet vehicles
Many vans and older fleet vehicles still use transponder keys. Getting a spare for each vehicle cuts downtime, and business invoicing is available.
Signs your transponder chip is failing
A car that takes several attempts to start, an immobiliser warning light that stays on, or a key that works one day and not the next are all signs the chip may be failing or has lost its programming. Getting a spare made while the original still works means you're never caught out when it finally stops. We can test the existing key on your car and tell you whether it's the chip, the blade or something in the vehicle.
Transponder keys for older and classic vehicles
Many older cars and vans use transponder systems that are no longer supported by the dealer, or where genuine keys are hard to find. Aftermarket and universal keys are often available for these vehicles and can be programmed with diagnostic equipment, keeping an older car practical without a costly trip to a specialist.
What we need for an accurate quote
Every vehicle is quoted individually, and quotes are free. To give you a precise price first time, send us your vehicle registration, whether the vehicle is an import and where it came from, any electrical or vehicle faults you know about, your location, and a photo of any existing working key. With that, we can confirm the right key and method before we travel, so there are no surprises on the day.
Who does the work
SwiftAccess Auto is run by founder James Klamut, based in Chinnor. James holds an Automotive Locksmith Course Completion Certificate, a course acknowledged by MALA, is DBS checked and carries £10 million public liability cover through Locksure. You speak to the person who does the job, from first call to final test, which is why customers regularly mention clear communication and being kept informed throughout.
FAQs
Spare Transponder Keys questions
What is a transponder key?
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A key with a small chip in the head that communicates with your car's immobiliser. The engine will only start when the chip sends the correct code.
How much does a spare transponder key cost?
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It depends on your vehicle and the key option you choose. Every job is quoted individually and quotes are free.
My copied key opens the door but won't start the car. Why?
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The blade was cut but the chip wasn't programmed to your immobiliser. We can program a compatible key, or supply a new one.
How long does it take?
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Most spare transponder keys are cut and programmed on a single visit.
Can you reuse the chip from my old key?
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Sometimes. If your key case or blade is damaged but the chip works, a refurbishment may be an option. See our key refurbishment and repair service.
Do you come to me?
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Yes. We're fully mobile across Oxfordshire, Buckinghamshire and Berkshire.
Can you make a transponder key for an older car?
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In many cases, yes. Aftermarket and universal keys are available for many older vehicles and can be programmed to the immobiliser on site. Send your registration and we'll confirm the options.
Do you need to take my car anywhere to program a transponder key?
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No. Programming is done at your vehicle using onboard procedures or diagnostic equipment, wherever the car is parked.
Which areas do you cover?
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We're based in Chinnor and cover Oxfordshire, Buckinghamshire and Berkshire, including Aylesbury, High Wycombe, Thame, Benson, Witney, Bicester, Wendover, Beaconsfield, Gerrards Cross, Maidenhead and Amersham. If your town isn't listed, call and ask; we cover many surrounding villages too.
How do I pay?
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Card (with an emailed receipt), bank transfer or cash. We're not VAT registered, so no VAT is added to your bill. Business and fleet customers can be invoiced.
Do you offer a warranty on keys?
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No. Keys can be damaged by drops, water or a flat battery, so we don't offer a warranty on supplied or cut keys. What we do is test every key on your vehicle before we leave, so you see it working with your own eyes.
Related services
Where we offer spare transponder keys
Spare Transponder Keys in Oxfordshire · Spare Transponder Keys in Buckinghamshire · Spare Transponder Keys in Berkshire · Spare Transponder Keys in Aylesbury · Spare Transponder Keys in High Wycombe · Spare Transponder Keys in Thame · Spare Transponder Keys in Benson · Spare Transponder Keys in Witney · Spare Transponder Keys in Bicester · Spare Transponder Keys in Wendover · Spare Transponder Keys in Beaconsfield · Spare Transponder Keys in Gerrards Cross · Spare Transponder Keys in Maidenhead · Spare Transponder Keys in Amersham · Spare Transponder Keys in Berkhamsted. Or request a free auto locksmith quote.
Free quote
Get a spare transponder key that just works
Send your details and we'll reply with a clear price for your vehicle. In a hurry? Calling is fastest.
07468 189652- Free, no-obligation quotes
- DBS checked · £10m public liability
- Rated 5 stars on Google
- Base
- 11 Claremont Place, Chinnor, Oxfordshire, OX39 4FX
- Hours
- Open 24 hours, 7 days