Cut, programmed and tested at your car. Most models, most years.
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BMWs from roughly the mid-1990s through the mid-2000s use a bladed key with a chip and remote buttons built in. The blade gets cut, but the electronics also have to be authorized by the car's security module — a cut-only copy turns the lock and does nothing else.
Many mid-2000s to early-2010s BMWs replaced the metal ignition key with a rectangular fob that slides into a dash slot. Replacing one is mostly a programming job rather than a cutting job, plus an emergency blade cut for the doors.
On many trims the fob stays in your pocket: the car unlocks at the door handle and starts by button. A replacement has to be paired to the car's electronics, and the hidden emergency blade inside the fob cut to match your door locks.
Some recent 5 Series, 7 Series and X models offer a touchscreen Display Key, and many current BMWs support a phone-based digital key. These supplement a physical fob rather than replace it — the car should always have at least one programmed fob.
A plain metal blade, a transponder chip, a remote and a proximity fob are four different jobs.
Newer immobilizer generations take extra steps — and on the newest systems, extra authorization.
Copying a working key is the small version of the job; starting from zero keys is the big one.
Secure garages, gated lots and after-midnight calls can change the trip, never the honesty of the quote.
A fair shop quotes a range for your exact car up front, and the final price is agreed before work starts. On BMWs the range moves more than on most makes: the model year decides which security-module generation is involved, the key type runs from a bladed remote to a Comfort Access smart fob, and all-keys-lost adds programming steps that a spare-key job doesn't have.
BMW has built electronic immobilizers into its cars since roughly the mid-1990s, and the security architecture behind the key has been redesigned several times since. Each generation of security module stores and authorizes keys differently, so the programming procedure depends on which generation your car carries — not just on the key in your hand. On many older BMWs a replacement key can be prepared from the vehicle's key data and then synced to the car; on newer ones the fob is married to the car's electronics and programming runs through the vehicle itself. Model year and VIN usually settle which case applies.
Losing every key to a BMW is a different conversation depending on the car's age. On many older models — very roughly, cars from the 2000s and early 2010s — all-keys-lost is normally workable as a mobile job: a new key is prepared against the car's security module and synced where the car sits. On newer BMWs the honest picture is harder: the security electronics are locked down tighter, the procedure can require extended access to the car's modules or manufacturer-side authorization, and on some recent models the realistic path runs through a dealer rather than a curbside visit. The straight answer comes from the model and year, so pin down whether your specific BMW is a mobile-serviceable case up front — not with a wasted visit that can't finish the job.
It depends on the year. On many older BMWs — roughly through the early 2010s — a properly equipped locksmith can prepare and program a replacement key on-site. On the newest models the security electronics are much tighter, and some situations, especially all keys lost, are realistically dealer territory. Which side of that line your car falls on comes down to the model and year, so get that confirmed up front.
The keyless-entry part doesn't change the fundamentals: a spare Comfort Access fob still has to be paired to the car's electronics, and the emergency blade hidden inside it cut to your doors. Once paired, the new fob works with pocket unlock and push-button start the same as the original.
Sometimes — and it's better to hear the honest version first. All-keys-lost on newer BMWs can require extended work with the car's security modules or manufacturer-side authorization, and on some models the practical path is through a dealer. The model and year settle it, so insist on a straight answer about whether yours is a mobile case before agreeing to a visit.
The fob is a small computer — rolling-code remote, transponder chip, often proximity hardware — and it has to be authorized by the car's security module, which on BMW is a more involved procedure than on many mainstream makes. That's also why the price depends on year and key type: expect the quote as a range for your exact car, with the final price agreed before work starts.
Yes. With one working key, adding a spare is a straightforward pairing; all-keys-lost on a BMW can be a far longer and costlier procedure, and on newer models sometimes not a mobile one at all. One working fob is the cheapest moment to make the second. On many models the car also tracks a limited number of key slots, which gets checked during pairing.
Often it's just the fob battery. Many BMWs have a marked backup position — on the steering column or in the console — where holding the fob lets the car read it and start even with a dead fob battery; check the owner's manual for your model. If a fresh battery and the backup position don't help, the fob or the car's key electronics need a proper look.