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BMW CAS & EWS3 Security-Module Cloning — Failed Module Replacement, Keys Preserved

BMW cranks but won't start after a CAS or EWS3 failed — or you dropped in a used one and it won't accept your keys? Mail in your original plus a matching donor and we clone the complete data — ISN, keys, VIN, mileage, coding — so the replacement is plug-and-play and your existing keys keep working.

$250 flatFast TurnaroundFlat-rate return shipping

Sending several modules? Add them all — one box, one return-shipping charge.

Text Before You Buy

BMW and MINI CAS1 / CAS2 / CAS3 / CAS3+ and EWS3 security modules — E38/E39/E46/E52/E53, E65/E66 745i/750i/760i, E60/E61/E63/E64, E70/E71, E82/E88, E83, E85/E86/E89, E90/E91/E92/E93 and R55/R56/R57 MINI. F-series CAS4 / CAS4+ handled separately. Verified by VIN + module label before you ship.

How It Works

Three simple steps. Hundreds of mail-in jobs completed for shops, locksmiths, and DIY pros.

BMW CAS Car Access System module opened on the bench for cloning
1

Pay & Get Address

Click "Order Now", pay securely online. We email shipping address + instructions within minutes.

Software cloning BMW ISN, key data, VIN, and mileage between CAS modules
2

Ship Your Module

Pack per the instructions and ship to Arlington. USPS goes to our PO Box; UPS and FedEx must use the street address. Customer pays shipping to us.

Macro view of a BMW CAS module circuit board and memory
3

Receive in 1-2 Days

Work completed within 24 hours of receipt. Ships back next business day at the return speed you chose at checkout — standard to overnight. Tracking emailed.

What You Get

  • Your original CAS / EWS3's complete data — ISN, key data, VIN, mileage, coding — cloned onto the donor
  • A plug-and-play replacement module: existing keys keep working, no re-cut and no re-code
  • Donor generation-match verified by VIN and module label before you ship
  • Bench read + verify of both modules before anything is written
  • Bench communication test on a stable, regulated power supply before return
  • Clear install notes — what to expect at first key-on
  • Modules returned with tracking — return-shipping speed your choice at checkout

Compatibility

Confirm your part matches one of the variants below before ordering. Not sure? Text us a photo and we'll verify.

EWS3 — the pre-CAS immobilizer box

EWS3 / EWS3.3 module cloning onto a matched donorE38 7-Series (740i, 750iL) and E39 5-SeriesE46 3-Series, E52 Z8, E53 X5Early E83 X3 and E85 Z4 where the car still uses EWS rather than CASKeys, ISN and rolling-code sync copied across so nothing has to be re-learned

CAS1 — first-generation Car Access System

CAS1 module cloning, 2002-2008E65 / E66 7-Series — 745i, 745Li, 750i, 750Li, 760i, 760LiOften the failure behind a dead comfort-access system or an intermittent no-start on these carsDonor must be CAS1 — a CAS2 or CAS3 unit is not a substitute

CAS2 — 2005-2008 3, 5, 6, X and MINI

CAS2 module cloning for BMW and MINIE60 / E61 5-Series and E63 / E64 6-SeriesE90 / E91 / E92 / E93 3-Series (early production)E70 X5 and E83 X3R55 / R56 / R57 MINI Cooper and Cooper S on the shared CAS2 architecture

CAS3 / CAS3+ — the security key module most people arrive with

CAS3 and CAS3+ (encrypted) security key module cloning, BMW and MINIE90 / E91 / E92 / E93 3-Series, E82 / E88 1-SeriesE60 / E61 LCI 5-Series, E63 / E64 6-SeriesE70 X5, E71 X6, E89 Z4CAS3+ units are encrypted — we identify plain CAS3 vs CAS3+ off the label and VIN before you buy a donor

Data cloned to the donor

ISN (individual serial number — the immobilizer secret)Key data — your existing keys keep workingVIN and vehicle codingStored mileage

Related modules — handled on their own pages, not this one

FRM2 / FRM3 footwell and light control modules (X-, Z-, 1- and 3-Series 2006-2008) — see our BMW FRM footwell module repair serviceBMW and MINI FEM / BDC cloning and key work — see our FEM/BDC key programming and FEM/BDC bricked-module recovery servicesKBM gateway body control module (E60 5-Series, E63 / E64 6-Series) — see our central gateway module clone serviceThe engine ECU itself — see our BMW DME ECU clone (immobilizer preserved) or BMW DME EWS delete (handshake removed)F-series CAS4 / CAS4+ — different architecture, handled separately

Best for

Failed or water-damaged CAS / EWS3 being replacedCranks-no-start after a used CAS was installedPreserving existing keys without re-cutting or re-codingAvoiding a dealer CAS order plus an on-car coding billOne listing across every CAS generation instead of a separate SKU per module

Will This Fix My Problem?

Honest answer: here's exactly what this service fixes — and what it doesn't.

Fixes:

  • ✓CAS or EWS3 failed and the car won't start or won't recognize keys
  • ✓Water- or corrosion-damaged CAS module needs replacing
  • ✓Used CAS installed and the car cranks but won't start (identity mismatch)
  • ✓You want existing keys preserved instead of re-coding or re-cutting
  • ✓Intermittent no-start / no-crank traced to a failing CAS
  • ✓Replacing a CAS / EWS3 and you want the donor plug-and-play before it goes in

Won't fix:

  • ✗Does not include the donor CAS / EWS module — you source a generation-matched used unit (we verify it first)
  • ✗Does not clone a stone-dead original whose memory can't be read — that becomes our ECU advanced recovery service (board repair or a direct chip read), quoted separately
  • ✗Does not cover F-series CAS4 / CAS4+ under this listing — different architecture, handled separately
  • ✗Does not add a new key to a healthy module — that's our BMW CAS key programming service
  • ✗Does not delete the EWS / immobilizer handshake — that's our BMW DME EWS delete service (MS41-MS45, ME7.2/ME9.2, MSV70, MSV80/81, MSD80/81, MINI EMS2)
  • ✗Does not clone the engine ECU — a DME cloned onto a donor with the ISN preserved is our BMW DME ECU clone service, and a used F-chassis DME matched to your CAS or FEM/BDC is our BMW F-series used-DME programming service
  • ✗Does not cover the FRM2 / FRM3 footwell module, BMW and MINI FEM/BDC, or the KBM gateway BCM (E60, E63/E64) — those are our FRM repair, FEM/BDC, and central gateway module clone services
  • ✗Does not fix a no-start caused by fuel, spark, sensors, wiring, or a dead battery
  • ✗Does not bypass proof of ownership

Your keys keep working — that's the whole point of cloning

A replacement CAS or EWS3 comes blank: it doesn't know your car and it doesn't know your keys, so a bare swap leaves you with an engine that cranks but never starts and keys the module won't accept. Cloning solves both at once — we copy your original's ISN, key data, VIN, mileage, and coding onto the donor, so the module installs plug-and-play and your existing keys work exactly as before. No re-cutting, no re-coding, no dealer visit. The donor must match your generation (CAS3 to CAS3), and because this is immobilizer work, proof of ownership is required before we begin. One listing covers every generation — EWS3 on the E38/E39/E46/E53, CAS1 on the E65/E66 745i/750i/760i, CAS2 on early E60/E90/E70 and R55–R57 MINI, and CAS3/CAS3+ on the E82/E88, E90-E93, E60 LCI, E63/E64, E70, E71 and E89. Neighbouring modules live on their own pages: the FRM2/FRM3 footwell module is our BMW FRM repair, BMW and MINI FEM/BDC work is our FEM/BDC key programming and bricked-module recovery, and the KBM gateway BCM on the E60 and E63/E64 is our central gateway module clone.

Shipping Instructions

These details are also emailed to you the moment your payment clears.

Verify first: text or email us your VIN plus photos of your original CAS/EWS module label and the donor's label — a technician confirms the donor is a generation match (CAS3 to CAS3) before you ship. Then send both modules (original + donor) to PO Box 120241, Arlington TX 76012 if you ship USPS — or 1009 Oakwood Ln # 120241, Arlington TX 76012 if you ship UPS or FedEx (UPS and FedEx cannot deliver to a PO Box). We clone the data on the bench, test communication, and ship both back via the return option you pick at checkout (Standard $24.95, UPS 2-Day $54.95, or UPS overnight $94.95).

What to include in your box

  • Your original CAS or EWS3 module AND the donor module
  • Year, make, model, and chassis (e.g. 2008 BMW 328i E90)
  • VIN of the vehicle
  • CAS / EWS part number off BOTH module labels (we pre-verify the generation match)
  • How many working keys you currently have
  • What is wrong now: dead module, cranks-no-start after swap, water damage, etc.
  • Proof of ownership (title, registration, or bill of sale)
  • Your name, return address, and phone number

Ship to

Auto Module Lab

If shipping USPS

PO Box 120241
Arlington, TX 76012

If shipping UPS or FedEx

1009 Oakwood Ln # 120241
Arlington, TX 76012

Both shipping labels — to the lab and back to you — are purchased the moment you order. Your prepaid inbound label (already addressed) arrives by email; the return ships on the speed you chose at checkout.

Need to perform this job remotely?

Get an Auto Module Lab Remote Programming Kit and have our technicians program supported vehicles from your shop — the car stays on your lift and nothing gets posted.

View Programming Kits Request Remote Programming

Buy the interface once — program with us anytime. Supported procedures vary by vehicle, module, OEM software and security requirements.

Frequently Asked

Still have a question? Text us — replies in minutes.

Which BMW modules and chassis does this cover?
EWS3 (E38, E39, E46, E53), CAS1 (E65, E66), CAS2 (early E60 and E9x), and CAS3 / CAS3+ (E60/E61/E63/E70/E71/E82/E90/E91/E92/E93). It does NOT cover the F-series CAS4 / CAS4+ — that's a different architecture we handle separately. Send us your VIN and a photo of the module label and we'll confirm your generation before you ship or buy a donor.
Will my existing keys still work after the clone?
Yes — that's the point. We copy your original module's ISN and key data onto the donor, so the cloned module recognizes your existing keys exactly as before. No re-cutting, no re-coding, no new keys to buy. The car sees the same immobilizer identity it always had, and the swap is plug-and-play.
How is this different from CAS key programming or a DME EWS delete?
Three different jobs. CAS key programming ADDS a key to a healthy module. A DME EWS delete REMOVES the immobilizer handshake so a DME runs without the CAS/EWS. This service CLONES a failed CAS/EWS onto a donor so you can replace a dead module and keep everything working. If your module is healthy and you just need a key, or you want the handshake removed, those are our separate services.
Do you supply the donor CAS / EWS module?
No — you source a used donor from the SAME generation as your original (CAS3 to CAS3, EWS3 to EWS3), from eBay, a salvage yard, or a parts recycler. Match the BMW part number on the label as closely as possible. Send us photos of both labels plus your VIN before you buy and a technician confirms the pair is compatible, at no charge.
My original CAS is completely dead — can you still clone it?
Cloning needs a readable original — if the module still powers up and its memory reads, we clone it. If it's stone dead and the memory can't be read at all, cloning isn't possible; that becomes an advanced recovery job (board repair or a direct chip read) at the recovery tier. Send us the VIN and symptoms and we'll tell you which path yours is before you ship.
Does this cover F-series CAS4 / CAS4+?
Not under this listing. CAS4 and CAS4+ (F-chassis) use a different architecture and a different procedure, and later F-chassis cars use FEM/BDC instead. We handle those separately — send your VIN and we'll point you at the right service. This service is specifically for EWS3 and CAS1/2/3/3+.
Do you need proof of ownership?
Yes. The CAS/EWS is the car's immobilizer, so cloning it is security work — we require proof of ownership (title, registration, or a bill of sale) before any work begins. This protects you and keeps the service legitimate. It's a standard step and doesn't slow the job down once your paperwork is in.
How much is it and how does the mail-in work?
It is $250 flat. After a technician verifies your VIN and both module labels are a generation match, you ship the original and the donor to Auto Module Lab in Arlington, TX. We clone the data on the bench, test communication, and ship both back with tracking — return speed your choice at checkout (Standard $24.95, UPS 2-Day $54.95, or UPS overnight $94.95).

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Where we serve BMW CAS / EWS3 Module Clone

Mail-in means nationwide — we accept modules from all 50 states and DC from our Arlington, Texas lab. See your state, metro, or specific vehicle:

All 51 US states + DC

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Ready to ship?

$250 flat, fast turnaround. Pay now, get the shipping address by email, drop it in the mail. Your module is back on your bench within a week.

(817) 678-3252