A customer may describe every vehicle key as a “fob”, but that word can refer to several different products. One vehicle uses a conventional blade with an electronic transponder. Another has a folding remote key. A third uses a smart key that stays in the driver’s pocket. The differences affect the parts a locksmith selects, the questions they ask and the work required to provide a functioning replacement.
For someone entering automotive locksmithing, learning to identify the key system is more useful than memorising a list of vehicle makes. A familiar model name does not guarantee that every example uses the same key. Production year, specification and existing equipment can all matter. This guide explains the main categories and how a careful professional approaches an unfamiliar request.
A mechanical blade provides a physical way to operate a suitable vehicle lock or ignition. Its profile and cut must match the vehicle’s lock. Depending on the model, the blade may be exposed, fold into a remote housing or sit inside a smart key as an emergency insert.
It is easy to focus on the electronic functions and overlook the physical key. Yet a replacement that starts the vehicle but cannot operate its mechanical lock may leave the customer with an incomplete solution. Equally, a correctly cut blade does not necessarily mean the vehicle will start. The mechanical and electronic parts of the job must both be considered.
When identifying a blade, a locksmith checks the vehicle and the key already in use where one is available. They also consider whether a worn original could give a misleading impression of the intended cut. Good working practice means checking the finished result rather than assuming that a visually similar blank will behave as expected.
Many car keys contain a transponder that communicates with the vehicle’s immobiliser system. Its purpose is separate from the metal blade and, in many cases, separate from the buttons used for remote locking. This is why a newly cut key may turn in a lock yet fail to start the engine.
The exact chip and programming requirements depend on the vehicle. A locksmith therefore needs to identify the application before selecting a blank, transponder or complete key. Guessing can waste parts and time, particularly when two keys have similar cases but different electronic specifications.
For a new locksmith, this is an important distinction: “the blade fits” is one observation, not proof that the whole key is compatible. Learning how to check physical and electronic requirements together makes purchasing more accurate and customer explanations clearer. Access Fobs carries key blades and remote transponder chips as separate categories, reflecting those different parts of the job.
A remote fob lets the driver operate functions such as central locking with buttons. Some remote keys also include a blade and transponder in the same housing. Others have features and button layouts that vary by vehicle specification.
A customer might say their “key has stopped working” when the actual issue is limited to the remote buttons. The mechanical blade may still work, and the vehicle may still recognise the key for starting. That makes diagnosis important. A worn button, damaged casing, weak battery, failed remote function and a broader vehicle fault should not all lead automatically to the same replacement recommendation.
Before ordering, confirm the existing key style, the vehicle details and the relevant product information. Similar looking remotes can differ in ways that matter. Access Fobs has make-specific collections, including Peugeot keys and remotes and Renault replacement keys, but compatibility still needs checking at product level.
A smart key may allow keyless entry, push-button starting or both, depending on the vehicle. The driver may never remove the key from a pocket or bag during normal use. Even so, the key can contain an emergency mechanical blade for circumstances where electronic access is unavailable.
A smart key complaint needs careful questioning. Does the vehicle recognise the key at all? Has the issue developed gradually? Is there a working spare? Does an on-screen warning appear? Has the fob been damaged or had its battery replaced? The answers help establish what should be inspected before any replacement is ordered.
Security matters here too. Police.uk advises owners to keep keys away from the vehicle and use suitable precautions for keyless entry systems. A professional can direct customers to that vehicle security guidance without treating every smart key fault as a security incident.
Two vehicle keys may have the same number of buttons and almost identical cases. That does not establish that they are interchangeable. The internal components, frequency, blade, chip and intended vehicle application may differ.
This is especially relevant when a locksmith stocks parts for several makes. A product suitable for one production period may be wrong for a later vehicle with the same model name. Parts listings should be read carefully, and uncertain applications should be checked before promising a result to a customer.
The same principle applies to universal remote products. Their flexibility is valuable, but “universal” does not mean every remote works with every vehicle or programming tool. Access Fobs’ existing guide to Xhorse universal remotes explains why selecting the right type still matters. The aim is to carry useful stock while keeping every recommendation grounded in the particular vehicle.
If a customer has a working key, it may help with identification and verification. It also means the customer can often continue using the vehicle while a replacement is arranged. An all-keys-lost enquiry begins with less information and can require a different assessment of access, parts, equipment and time.
Neither description alone tells a locksmith exactly which procedure or product is required. The vehicle’s system and the circumstances of the job still decide that. A careful professional asks what keys remain, whether any are damaged, whether the vehicle is accessible and where it is located. They also establish the customer’s authority to request the work before proceeding.
Clear distinctions improve quotations. A customer asking for a spare should understand whether the price includes a new blade, remote functions and any required programming. Someone who has lost every key needs an explanation of what can be confirmed in advance and what depends on inspecting the vehicle.
A good first conversation can prevent a wasted visit or an incorrect order. Start with the make, model, year and registration, then ask about the key the customer currently uses. A clear photograph of an existing key may help, provided the customer does not disclose sensitive information unnecessarily.
Next, ask what has stopped working. Does the blade turn? Do the buttons respond? Will the vehicle start? Is the fault intermittent? Has another key been tried? These questions establish whether the customer needs a complete replacement, a specific component or further diagnosis.
The answers should be recorded accurately. “Remote not working” is more useful than “key broken” when preparing for a visit. Even then, telephone information remains provisional. Final parts selection should follow the product’s compatibility information and the findings from the vehicle.
Customers rarely want a lesson in transponders or immobilisers. They want to know what their new key will do. A straightforward explanation can cover whether it will operate the door, start the vehicle and provide remote locking where applicable.
Be clear about the difference between a replacement case, a cut blade and a complete programmed key. These may look similar in an online product photograph but serve very different purposes. Setting expectations before work begins reduces the chance of disappointment when a customer assumes every function is included.
After the work, verify the functions included in the agreed service. An orderly handover also gives the customer an opportunity to ask about a spare key and the best way to store it. The Highway Code’s vehicle security guidance is a useful independent reference for basic precautions when leaving a vehicle.
There is no practical benefit in assuming that one preferred key type or workflow covers every manufacturer. A locksmith working regularly on Ford vehicles may encounter different stock requirements from someone whose local work is mainly Nissan or Toyota.
Keep notes on the jobs you complete, the applications you check and the questions that helped you identify the correct product. Manufacturer and tool information can change, so those notes should support fresh checks rather than replace them. This habit also makes it easier to see where your knowledge is strong and where further supervised practice would help.
The aim is not to memorise an entire catalogue. It is to develop a reliable process: identify the vehicle, understand the key’s functions, check the proposed part and verify the finished work.
Buying a broad selection of remotes before understanding their applications can tie up money in parts you rarely use. A better starting point is to study the vehicles you expect to work on, understand the distinction between their key systems and build stock around realistic demand.
Practical learning helps connect the product on a screen with the vehicle in front of you. Access Fobs’ automotive locksmith training options provide opportunities to develop that understanding with guidance. The course collection should be checked for current subjects and availability, as a specialist workshop will not cover every vehicle or replace ongoing experience.
Whether you are starting out or adding automotive work to an existing service, accurate identification comes first. It helps you select the right parts, explain the job honestly and deliver a replacement key whose agreed functions have actually been checked.
