BMW car key replacement, every model and year

BMW models in the guide

• 3 Series
• 5 Series
• 7 Series
• X1
• X3
• X5

How have BMW keys changed over the years?

BMW key systems fall into clear eras, and the era matters more than the model name. It tells us what your key is, what equipment the job needs, and whether a locksmith can do it at all. Here is the picture as we work with it.

Years overlap because BMW did not change every model at once. A 2006 3 Series coupe and a 2006 3 Series sedan can belong to different eras, which is why we confirm by VIN before we promise anything.

• EWS era (through the mid-2000s, and to 2010 on the E83 X3): the EWS immobilizer with an ID44 (PCF7935) remote-head 'diamond' key.
• CAS era (starting with the 2002 E65 7 Series, then the 2004 E60 5 Series, 2006 E90 3 Series, 2007 E70 X5 and 2013-2015 E84 X1): an ID46 (PCF7945/Hitag2) fob that inserts into a dash slot, with a Start button. The CAS module itself runs from CAS1 through CAS3+.
• F-chassis era (F01 7 Series 2009, F10 5 Series 2011, F25 X3 2011, F30 3 Series 2012, F15 X5 2014, F48 X1 2016): true keyless smart fobs on the ID49 (PCF7953P, Hitag Pro) chip. The F01, F10 and F25 use CAS4/CAS4+ modules; the F30, F15 and F48 use FEM/BDC body modules.
• G-chassis era (2016 G11 7 Series onward): a BDC2 body controller with the N5F-ID21A-family 434 MHz fob.
• Newest generations (G70 7 Series 2023, U11 X1 2023, G60 5 Series 2024, G45 X3 2025): Digital Key architectures with no established aftermarket path yet.

What does replacing a BMW key involve for each era?

The work changes a lot from one era to the next. Here is what each one realistically looks like.

• EWS cars: routine specialist work. The new key is originated from the EWS module data on the bench, and that holds even when every key is lost. The diamond-head key on an E46 uses an HU92 2-track blade, which we cut to match.
• CAS1 through CAS3+ cars: documented procedures exist for adding a key over the OBD port and for all-keys-lost. Late CAS3+ firmware can need a flash downgrade before a key will take, which adds time and care.
• CAS4/CAS4+ and FEM/BDC F-chassis cars (2009-2022 depending on model): advanced specialist jobs. Some tools work through the OBD port, others need bench work on the module. It is possible, but only with dedicated BMW equipment, and not every locksmith carries it.
• G-chassis BDC2 cars (2016 onward): adding a key is specialist-possible when you still have a working key. All-keys-lost is effectively dealer-only.
• G70, U11, G60 and G45: dealer-only for key work, period.

What if I've lost every BMW key?

This is where honesty matters most, because some online advice makes it sound simpler than it is.

On EWS and CAS-era cars, all-keys-lost is a job we can approach. It takes longer than adding a spare, and the module generation decides the method, but it is a known procedure.

On F-chassis cars with CAS4/CAS4+ or FEM/BDC modules, it is still possible but demanding. We confirm the exact module by VIN first, and if your car needs equipment or a procedure we can't responsibly perform, we tell you that before any work begins.

On G-chassis cars, all-keys-lost is effectively dealer territory. There is one advertised aftermarket route, but it locks the car against future dealer keys. We don't use it and we won't promise G-series all-keys-lost. That trade-off is the kind of thing you shouldn't find out about later.

For the newest generations, the G70, U11, G60 and G45, the dealer is the only path. BMW also does not use the NASTF SDRM process the way domestic makes do, and dealer paths require proof of ownership, so have your registration and ID ready.

How a BMW key job goes, step by step

Whether you call from a driveway or a parking structure, the order of work is the same.

1. You call (213) 577-1366. A person answers around the clock, and you tell us the model, year and what happened.
2. We pin down the era from the VIN: which immobilizer or module the car has, and whether you have a working key.
3. We tell you plainly whether it is a job we do, a job that needs special equipment, or a dealer-only case, before anyone drives out.
4. If it is ours, a mobile van comes to the car. We ask you to show the car is yours, which is standard for any reputable locksmith.
5. We cut the blade where one is needed, then program the new key to the car's module.
6. We test every function: starting, locking, the remote buttons and any spare keys you already own.
7. If the problem turns out to be something other than the key, we say so rather than sell you a key you don't need.

What affects the cost of a BMW key replacement?

We don't quote numbers on a web page, because the same model can be a very different job depending on a few facts. These are the real drivers.

The first is the era. An EWS diamond key and a G-series smart fob are different hardware with different programming effort. The second is whether you have a working key. Adding a key to a car that still has one is a smaller job than originating keys from scratch.

The third is the module. A late CAS3+ car that needs a flash downgrade involves more steps than an earlier CAS2 car. F-chassis cars needing bench work on the module take more time and equipment than those that program over the OBD port.

The fourth is the key itself: what type it is, how readily the right hardware is available, and whether it needs a cut blade. The last is when and where you need us. A night call on the far edge of our service area is a different trip than a daytime visit near the storefront.

If the dealer is the only route, there can be costs beyond the key, such as getting the car to the dealership. When we can do the job, it is usually the more economical route because we come to you, but we won't claim that for cases where it isn't true.

Common BMW key problems (and what is often the real cause)

Not every BMW key complaint needs a new key. Several of these are fixes for something else, and we would rather diagnose first.

• Dead rechargeable key batteries on 2000s EWS and slot-key cars. The remote stops working, but the chip still starts the car, so the key may only need attention to its battery.
• Electronic steering-lock (ELV) failures on E-series slot-key cars. These often get misdiagnosed as key problems.
• Worn dash key slots and fobs that no longer hold a charge.
• Dead smart-fob coin cells on F and G-chassis cars. The dash says 'key not detected' while the emergency blade still opens the door.
• Cracked key shells, broken flip hinges (a known problem on the E83 X3) and worn buttons. Often the electronics are fine and the shell is the issue.
• Comfort Access door-handle sensor faults that get blamed on the key.
• Sticker-shock on lost-key jobs for G-chassis cars, where all-keys-lost is dealer territory and there is little room to shop around.

Mobile locksmith or BMW dealer: which makes sense?

Both are legitimate, and which is better depends on your car.

A mobile locksmith makes sense when the car is stuck where it is: a lot, a street, a driveway. We come to it, so no tow is needed, and for EWS, CAS and many F-chassis cars we can cut and program on the spot. That convenience is the main advantage. It also helps that you deal with one company from phone to finished key.

The dealer is the right answer in some cases. If your car is a G70, U11, G60 or G45, only the dealer does key work. If your G-chassis car has no working key at all, the dealer is effectively the only sound route, since the one aftermarket option locks out future dealer keys. If your car is still under a warranty or service arrangement that you want to keep tidy, ask the dealer first.

For everything in between, call us and describe the car. If it belongs at the dealer, we will say so. A straight answer in the first call saves you time either way.

3 Series key replacement by generation

The 3 Series shows the era changes clearly. Our full 3 Series key page goes deeper, but here is the outline.

E46 (1999-2006) cars use EWS3/EWS4 with the ID44 (PCF7935) diamond key on an HU92 2-track blade. Sedans ran through 2005, while coupes and convertibles carried into 2006 alongside the new E90 sedan.

E90/E91/E92/E93 (2006-2013) cars are CAS era: CAS2 on the earliest, CAS3 or CAS3+ later. We confirm the module generation per VIN. The key is an ID46 (PCF7945/Hitag2) slot fob with a Start button, and the coupe and convertible ran through 2013 alongside the F30 sedan.

F30/F31/F34 (2012-2018) cars have a FEM body module and an ID49 (PCF7953P, Hitag Pro) smart key, with push-button start standard. Vendor catalogs list the same CAS4/FEM key hardware for these years.

G20 (2019-2026) cars use a BDC2 controller and a 434 MHz N5F-ID21A-family smart key. Add-a-key is specialist work with a working key, and all-keys-lost is effectively dealer-only.

Other BMW models we get asked about

The same era logic applies across the lineup, so a model's year matters more than its badge.

The 5 Series moves from CAS-era slot fobs on the 2004 E60 to smart fobs on the 2011 F10, and the 2024 G60 is dealer-only. The 7 Series began the CAS era with the 2002 E65, went keyless on the 2009 F01, and reached Digital Key with the 2023 G70.

The X3 stayed in the EWS era to 2010 on the E83, then moved to the F25 in 2011 and the dealer-only G45 in 2025. The X5 shifts from the 2007 E70 to the 2014 F15. The X1 spans the 2013-2015 E84, the 2016 F48 and the dealer-only 2023 U11.

If you aren't sure where your car falls, the car keys overview covers other makes too, or you can contact us with your VIN.

Why call Wilshire Lock & Key for a BMW key?

We have been in business since 1987 and serve 140 cities across Los Angeles and Ventura counties. We work from a storefront at 10740 Wilshire Blvd in Westwood plus mobile service vans, so the person answering the phone works for the same company that sends the van. There are no dispatch middlemen in between.

David, our owner and lead technician, oversees the work. That matters on BMWs, where the right call is often to say no to the wrong method rather than try it.

One more point: California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith you call for it. You can learn more about us on the Wilshire Lock & Key home page, or call (213) 577-1366 any hour, any day.