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Car Key Programming Oxford Keys and Fobs Coded From £55
Bought a key online, swapped a car battery or dropped your fob and now the car ignores it? We code chips and pair remotes on the spot through the OBD port, programming only from £55.
Get a programming price
Tell us what you need and we will call you straight back. Calling is quickest: 07520 644 595. Photos by WhatsApp: 07466 695655
Coded through the OBD port
Diagnostic equipment plugged in at the car. No dealer visit needed.
Online key checked first
Send the listing and we tell you if it can be coded before you buy.
Remote and chip both done
Immobiliser chip and lock buttons are separate systems. We set up both.
Battery tested free
If a new coin cell is all you need, we say so before charging for coding.
Car key programming in Oxford costs £55 to £95 when you already have a key that is cut, and we do it at your car by connecting coding equipment to the diagnostic port, usually in under 40 minutes. It fixes keys that turn but will not start the engine, remotes that stopped locking, and new blanks bought online.
If you need us to supply and cut the key too, prices start from £90 for a spare and £120 for a remote key. All of our car work is listed on the car key replacement hub.
Does your key need programming? Match the symptom
Not every dead key needs coding. This table covers the problems we are most often asked about in Oxford and the likely fix for each.
| What happens | Most likely cause | Fix |
|---|---|---|
| Buttons do nothing, key still starts the car | Flat coin cell in the fob | New battery, often a CR2032 or CR2025 |
| New battery fitted, buttons still dead | Remote has lost its pairing | Re-sync the remote to the car |
| Key turns, dash immobiliser light flashes, no start | Chip not recognised | Recode the chip or fit a new one |
| Problems began after a car battery change | Module lost its stored keys | Program keys back in |
| Copied key opens doors but will not start | Blade cut, chip never coded | Programming only, £55 to £95 |
If the key will not physically turn in the ignition, programming will not help. That is a barrel fault, covered by our mobile auto locksmith.
Remote sync and immobiliser coding are two different jobs
Most drivers think of their key as one device, but it contains two separate systems that each have to be set up.
Immobiliser transponder
A tiny chip, often without its own battery, read by a coil around the ignition or by the start button reader. If the code does not match the list stored in the car, fuel or ignition is cut and the engine will not run.
Controls whether the car starts.
Remote transmitter
The battery powered circuit behind the buttons. It sends a radio signal to the central locking, on 433 MHz for most UK market cars. It can lose its pairing without the chip being affected.
Controls locking, unlocking and the boot.
This is why a key can start the car but not open it, or open it but not start it. When we program a key we check both systems and test each one separately.
How car key programming works through the OBD port
Every car built since the early 2000s has a diagnostic socket, usually under the dashboard near the steering column. Our programmer connects there and talks to the immobiliser module.
- Identify the system. The registration tells us the chip family and whether the car needs a security PIN or an online check.
- Read or enter the security data. On many cars the equipment retrieves the PIN directly; on others it has to be entered.
- Add the key. The new key’s chip is written into the car’s list of accepted keys alongside your existing ones.
- Remove any missing keys. Lost or stolen keys can be deleted at this stage on most systems.
- Pair the remote and test. Buttons are synced, then we check starting, locking and the boot release.
Ownership is checked first, every time: V5C or lease agreement plus photo ID. We will not code a key to a car without them.
Why car keys bought online often cannot be programmed
A cheap fob from an online marketplace looks identical to the original, so it is a tempting way to save money. A good share of those we are asked to code turn out to be unusable. These are the usual reasons:
- Wrong frequency. Some fobs are made for other markets and transmit on 315 MHz, which UK cars will not hear.
- Wrong chip family. The listing may say it fits your model, but the chip inside is for a different year or trim.
- Used and locked keys. Many second hand keys have already been written to another car and cannot be wiped and reused, especially on Toyota, Lexus and VW group cars.
- Poor quality boards. Some cheap remotes simply fail to respond to programming at all.
Send us the link before you buy
WhatsApp the listing or a photo of the circuit board to 07466 695655 with your registration. We tell you honestly whether we can code it. If not, we can supply a key that we know works, cut and coded from £90.
Programming keyless and proximity fobs
Keyless fobs talk to aerials around the doors and cabin, so the car knows whether the key is inside or outside. Coding one adds it to the car’s proximity system as well as the immobiliser. Some makes, particularly newer Hyundai, Kia and Toyota models, need a PIN or an online authorisation step, which can add time.
After programming we test keyless entry at every door, the boot sensor and push button start, and confirm that the car warns you if the fob leaves the cabin with the engine running. More on these fobs is in our smart and proximity key guide, and brand specifics are on pages such as Toyota keys and Hyundai keys.
What to bring when we program a key
- Every key for the car. On many systems, adding a key wipes the stored list and rewrites it, so any key not present at the time stops starting the car.
- V5C and photo ID. Or a lease, hire or finance agreement for company cars.
- A healthy car battery. Coding draws power for several minutes, and a weak battery can interrupt the process. If yours has been struggling, tell us and we bring a booster.
- The key you bought, if any. Still in its packet if possible, so we can check the part number.
Changing the battery in your car key first
A flat fob battery is the most common reason a remote stops working, so try this before booking any programming. Most fobs split along the seam with a coin or a small flat screwdriver; keyless fobs often hide a release button for the emergency blade, and the case opens from that slot. Note which way up the old cell sits, fit the new one the same way, and press the case firmly back together.
If the buttons still do nothing, the remote may have dropped its pairing, which is a quick job on site. A cracked case, worn button pads or a broken battery clip is a physical fault instead, handled by our car key repair service. If you only want a second key rather than recoding the one you have, see our spare car key service.
Car key programming prices
Fixed before we set off and including VAT, coding and testing of both the chip and the remote.
| Service | Price | What's included |
|---|---|---|
| Programming only | £55 to £95 | Your key is already cut; chip coded and remote paired |
| Spare key supplied cut and coded | From £90 | Copied from your working key |
| Remote or flip key supplied | From £120 | Cut, coded and buttons paired |
| Keyless smart key supplied | From £160 | Proximity entry and start tested |
| All keys lost | From £170 | Key made and coded with no original |
| BMW Mercedes Audi and Lexus | From £220 | Exact price by model and year |
Prices include VAT and labour. Parts are listed separately. See the full Oxford locksmith price list.
