BMW 4 Series Locksmith Hamilton

4 Series F32/F33/F36 (2013–2020): Coupe, Convertible and Gran Coupe. Uses BMW's CAS4/FEM key system, the same family as the equivalent-era 3 Series. Comfort Access standard on Sport and M-Sport trims. All-keys-lost needs a BMW security token and, on FEM-equipped cars, a module bench read.

4 Series G22/G23 (2020–present): Current generation moved to BDC — BMW's most integrated body/key architecture. Falls mostly outside our coverage window; see the FAQ below on the 2021-onward cutoff.

M4 variants: The F82/F83 M4 and later G82 M4 share the same key platform as the standard 4 Series for their generation — no separate tooling required.

F32 Comfort Access signal weak: CR2032 battery failing in the fob — one of our most common 4 Series callouts. Correct cell carried on the van, re-paired on site.

F32/F36 all-keys-lost: CAS4/FEM security token access required. Where the car is FEM-equipped this is a bench job done at your location; where it's CAS4 it's usually a straight OBD write. We confirm which on the phone before travelling.

Worn Comfort Access key casing: The F-series fold-out key wears at the blade hinge with regular pocket carry. Cut and replaced on site.

Gran Coupe rear-seat key detection: A known quirk on some F36 units where the interior antenna under-detects a key left in the back — usually a programming re-sync rather than a hardware fault.

We service the following New Zealand 4 Series generations:

• F32/F33/F36 (2013–2020): CAS4 on earlier production (OBD write), FEM on later production (module bench job) — confirmed by build before we travel
• G22/G23 (2020 onward): BDC architecture, mostly outside our coverage window; see the FAQ on the 2021-onward cutoff
• M4 performance variants: Same key platform as the standard 4 Series for their generation, no separate tooling required

Call us with your registration and build year and we will confirm exactly which module your 4 Series uses and give you a price before travelling.

A Rototuna owner's only Comfort Access key to their 2016 435i Gran Coupe F36 was stolen along with a bag left in a cafe. With no spare and the car immobilised in a driveway, it was an urgent callout.

We arrived within 35 minutes. The F36 runs BMW's FEM module, so the job meant removing the module, reading it on the bench inside the van, generating a fresh key registration, writing it, and deleting the stolen key's code from the system entirely — so it could never be used to start the car again.

Total time on site: 90 minutes. The dealer had quoted $1,180 and a three-day wait for the part to arrive from Auckland; we had the family back on the road the same afternoon.