New Car Key vs Reprogrammed Key — What's the Difference?
The difference between a brand-new key blank (cut and programmed) versus re-coding an existing second-hand key blank — when each is appropriate and what to watch out for.
New Key Blank (Cut & Programmed)
The standard approach. We supply a new, compatible key blank, cut it to your vehicle's profile, and programme the transponder and/or remote. This is the most reliable option with no unknown history.
Second-Hand / Donor Key (Reprogrammed)
A second-hand key blank that previously belonged to a different vehicle can sometimes be reprogrammed to a new vehicle — if the blank type and generation are compatible. Cost can be lower. Risk: some fobs have one-time-programmable chips that cannot be recycled.
When Reprogramming Isn't Possible
Certain premium vehicles use crypto-based transponder chips that are vehicle-unique and cannot be reprogrammed to a new car. These require a new blank. Always confirm before purchasing a used fob.
Our Recommendation
For a permanent, reliable solution, a new key blank is always preferable. If cost is a concern, call Key 2 BHP — we price competitively and will advise on whether a used blank is viable for your specific vehicle.
Need a Mobile Auto Locksmith in Manchester?
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