Entry and starting are different functions
A vehicle may use a physical blade, remote buttons, electronic starting authorisation or a combination of features. Explain how your vehicle normally works instead of assuming that one description covers every key. The owner's manual is the appropriate reference for the actual arrangement.
Security features have limits
An immobilizer, changing radio codes and proximity checks address different aspects of vehicle access. Their presence should not be described as making theft impossible. Avoid using a general article to infer a particular encryption system, radio frequency or level of protection for your vehicle.
Keyless access and relay theft
Police describe relay theft as a method that can make a vehicle respond as though its keyless fob is nearby. That does not mean every vehicle is equally affected or that a button-start label alone identifies its protection. Consult manufacturer information about the relevant configuration and available security features.
Use layers of protection
Follow current police and manufacturer advice, check that the vehicle is locked, and consider the appropriate physical and key-storage measures for your situation. If you use a signal-blocking pouch, follow its instructions and test it with your vehicle. A pouch is not a guarantee against every form of vehicle theft.
Replacement-key enquiries
Tell the provider whether a key was lost and whether you are concerned about its continued use. Ask what the proposed work changes and what remains unchanged. Do not assume adding a new key automatically removes every access route associated with an old one.
Related services and enquiries
Compare lost-key replacement with spare-key duplication, or read about key fob programming. Check published price guidance and send your vehicle details.
Source and further reading
West Yorkshire Police: keyless theft guidance. Check the guidance relevant to your own vehicle.