Mitsubishi FAST-Key Programming and All Keys Lost (Outlander, ASX, Shogun)

Lock City08 June 2026

If you own a Mitsubishi, the name to know is FAST-Key — Mitsubishi’s branding for its keyless smart system (it stands for Free-hand Advanced Security Transmitter). It is the fob you keep in your pocket to unlock the Outlander or ASX and press the button to start. This guide explains how a FAST-Key is programmed, what all-keys-lost involves, and — crucially — two platform traps that mean the year of your car changes the job completely.

Why a Mitsubishi key is not a simple copy

Every modern Mitsubishi runs an electronic immobiliser. The FAST-Key fob (and the bladed transponder key on older and lower-trim cars) carries a secure chip that the car challenges before it will start. A key cut to fit the door but not programmed to the immobiliser will open the car but never fire the engine. So every Mitsubishi key job is two parts: cutting the blade (a MIT8 / MIT11-family profile, hidden inside the fob as an emergency blade on keyless cars) and programming the electronics.

What FAST-Key programming involves

A proper FAST-Key programme runs roughly like this:

Identify the exact key: confirm the model, year and chip type from your reg/VIN — as you will see below, this matters more on a Mitsubishi than on most cars.
Cut the emergency blade: the MIT8/MIT11 blade is cut to your locks by decoding them or to a key code.
Access the immobiliser: we connect via the OBD port with dealer-level software to put the immobiliser into a programmable state.
Programme the fob: the new FAST-Key (or bladed transponder key) is registered to the car, then tested — keyless entry, push-button start and, on a spare, that the existing keys still work.

Adding a spare vs all-keys-lost

The two most common jobs are very different in effort and cost:

Adding a spare (you still have one working key) is quick — the car already trusts a known key.
All-keys-lost (no working key at all) takes longer, because the car has to be brought into a programmable state from scratch. It is still very doable at the roadside; it just is not a five-minute job. A FAST-Key all-keys-lost is more involved than adding a spare, which is the best reason to get a coded spare while you still have a working key.

Trap 1: the 2023-on ASX is a Renault, not a Mitsubishi

This is the single most important thing to know about Mitsubishi keys today. The ASX ran in one basic form from 2010 to 2023 using the Mitsubishi FAST-Key system — but the all-new 2023 ASX is a rebadged Renault Captur, so it uses Renault’s key architecture entirely, not the old Mitsubishi kit [verify against your VIN]. A locksmith who assumes “ASX = Mitsubishi” will bring the wrong blank, chip and tooling. Telling us the year up front means we arrive with the right platform’s equipment first time.

Trap 2: the current Outlander is an alliance car

The Outlander has its own history. The 2007–2012 CW was a bladed transponder car; the 2012–2021 GF/GG made FAST-Key smart entry common across the range (including the popular PHEV, which uses exactly the same key as the petrol and diesel). The current 2021-on Outlander shares its platform with the Nissan X-Trail under the Renault-Nissan-Mitsubishi alliance, so its smart-key architecture follows the alliance system rather than the older Mitsubishi one [verify against your VIN].

And the Shogun: an older-4x4 job

The Shogun (Pajero) is a different case again — a hard-working 4x4, often an older vehicle down to a single tired key, on a MIT8/MIT11 bladed transponder system. These are generally straightforward roadside cut-and-code jobs, but they matter because a main dealer may no longer stock parts for the age of vehicle at all, making a mobile locksmith the practical route.

Is it definitely lost — or just a flat fob?

Before you commit to all-keys-lost, rule out the cheap stuff. If the key is in your hand but the buttons are weak or a keyless Mitsubishi will not detect the fob, that is usually a flat coin-cell battery (commonly a CR2032), not a lost or failed key — and you can often still start the car by holding the fob against the start button. If a key was stolen rather than mislaid, our stolen car keys service covers disabling the missing fob so it can no longer start the car — worth doing, as keyless SUVs are a relay-theft target.

Roadside Mitsubishi keys across Bristol & Bath

Lock City programmes Mitsubishi keys — FAST-Key and bladed — at your home, work or the roadside across Bristol, Bath and South Gloucestershire, with no towing and no dealer wait. We carry the right software and blanks for the Outlander, ASX and Shogun (and, for the 2023-on ASX, the Renault-family tooling it actually needs). See the Mitsubishi key hub, our car key programming service, or our lost car keys service. Prices depend on your exact model, year and key type, so we do not quote fixed figures — send us your registration for an exact quote. Call 07967 097 899, Mon–Fri 8am–5:30pm.