454 2004–2006 1st-gen Forfour
2004–2006 Smart Forfour (454, 1st gen)
Gas (Mitsubishi-sourced 1.1L / 1.3L / 1.5L 4-cyl, plus Brabus 1.5L turbo) or 1.5L CDI diesel, FWD, 5-speed manual or 6-speed Getrag softouch automated manual
Is this you? If your Smart has four doors, was sold 2004–2006, and a Mitsubishi mechanic looks at it and says "oh, that's basically a Colt," you're in the right place.
About this generation
The 454 Forfour is the first-generation four-door Smart, sold in Europe, the UK, and a handful of other markets from 2004 to 2006. It was never imported into North America. If you're reading this from the US or Canada and you have a 454, you brought it in privately or you're buying one abroad — these are not legal grey-market candidates in the US until 2029 at the earliest under the 25-year import rule.
The single most important thing to understand about the 454 is that it isn't really a Smart. It's a Mitsubishi Colt with a Smart badge and a different body. Smart and Mitsubishi co-developed the platform, the cars were built side-by-side at NedCar in Born, the Netherlands, and most of the mechanical parts under your 454 carry Mitsubishi part numbers, not Mercedes ones. The engines are the Mitsubishi 4G-series 4-cylinders. The gearboxes are Mitsubishi-sourced. Even the wiring conventions are closer to a Colt than to a 451 Fortwo. There's a reason long-time Smart fans either love the 454 ("easiest Smart to own — anything in a Colt parts catalog fits") or quietly dislike it ("it's not a real Smart"). Both views are correct.
The good news is the parts situation. Because the 454 is mechanically a Colt, parts availability across Europe is excellent and prices are low — much lower than Mercedes-spec parts for the 450/451/453. AutoDoc, Mister-Auto, and any decent EU Mitsubishi specialist can keep a 454 alive for less than what a 451 costs to maintain. Rust is a more typical concern than electrical drama. The bad news is the gearbox: the 454 was offered with a 6-speed "softouch" automated manual that's the same type of single-clutch box that gives the 450, 451, and 452 their reputation, and the 454 version has the same actuator-wear and shift-shock characteristics. If you have a softouch 454 and you don't already love automated manuals, learn to drive it like a stick or trade for a 5-speed manual.
Buy a 454 because you want a small, four-door, Mitsubishi-mechanical European hatch with a slightly more interesting badge than a Colt. Don't buy one expecting it to feel like a Mercedes-engineered Smart. It doesn't, and it never did. The Forfour name skips a generation after 2006 — there's no Smart Forfour from 2007 to 2014 — and when it returns as the 453, the formula is completely different: rear engine, Renault platform, twin to the Twingo III. The 454 is its own thing, and it sits closer to the Mitsubishi family tree than to the Smart one.
Quick specs
- Engine options
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- 1.1L 3-cylinder petrol (Mitsubishi 3A91, ~75 hp) — base trim
- 1.3L 4-cylinder petrol (Mitsubishi 4G15, ~95 hp)
- 1.5L 4-cylinder petrol (Mitsubishi 4G15-derived, ~109 hp)
- 1.5L 4-cylinder petrol turbo (Brabus tune, ~177 hp)
- 1.5L CDI 3-cylinder diesel (Mitsubishi-sourced, ~68 or 95 hp depending on tune)
- Gearbox
- 5-speed manual or 6-speed Getrag "softouch" automated manual. Some later cars carried the 6-speed twinshift variant. The softouch is a single-clutch automated manual — same family as the 450/451/452 mta. Not a torque-converter automatic and not a dual-clutch.
- MPG / Range
- 38–48 MPG combined (gas, varies by engine) · 55–65 MPG (1.5 CDI diesel)
- Length
- 12 ft 5 in (3,752 mm) — significantly longer than the Fortwo, in line with a Mitsubishi Colt
- Weight
- 2,260–2,580 lb (1,025–1,170 kg) depending on engine and trim
- Fuel
- Petrol variants run on regular unleaded (95 RON in EU). The Brabus 1.5T prefers 98 RON. The 1.5 CDI takes standard EU diesel.
- Built in
- NedCar plant, Born, Netherlands (shared production line with the Mitsubishi Colt)
- Seats
- 4 (4-door hatchback only — no Cabrio, no Coupe variant)
- Cargo
- 9.0 ft³ behind the rear seats, 38 ft³ with the rear bench folded
- Safety
- Tridion safety cell adaptation, dual front airbags, side curtains, ABS standard, ESP standard on most trims
Downloads & resources
The manuals, diagrams, and quick references that ship with this chassis. PDFs open in a new tab; on-site pages are owner-to-owner walkthroughs.
Missing a manual you'd expect to see? Email us — if it exists, we'll add it.
Trims & variants — what each one meant
Smart's trim names look interchangeable across generations, but they mean slightly different things on each chassis. Here's what the labels actually got you on the Forfour (454, 1st gen).
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Pure
Base trim. Steel wheels, manual A/C, cloth seats, basic radio. The 'I just want a small four-door' option. Volume seller in EU markets.
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Pulse
Mid-trim. Alloys, automatic climate in some markets, upgraded interior trim. The most common 454 spec in the UK.
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Passion
Top trim short of Brabus. Alloys, panoramic glass roof, leather wheel, the better stereo. The 'comfortable' Forfour spec.
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Brabus
The factory hot-rod. Brabus-tuned 1.5L turbo with ~177 hp, sport suspension, Brabus wheels and bodykit, leather sport seats. Production was tiny — these are genuinely rare cars and command a premium when they come up. If you're buying one, get a marque specialist to inspect it.
The first 30 days
If you just bought a Forfour (454, 1st gen), this is the order to do things in. Stay ahead of these and you'll save yourself a lot of money.
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Treat it like a Mitsubishi Colt for parts
Before you do anything, accept that the 454 is mechanically a Colt. When you need an oil filter, a water pump, an alternator, a strut, a bushing — search the Mitsubishi Colt 2004–2006 catalog first. The part number will almost always cross-reference, and the Mitsubishi-side price will be a fraction of what a Smart-badged version costs. AutoDoc and Mister-Auto in EU and Mitsubishi specialists in the UK are your friends. The Smart/Mercedes parts channel will charge you a Mercedes premium for parts that came off a Mitsubishi line.
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If it has the softouch gearbox, learn to drive it
The 6-speed softouch automated manual in the 454 is the same family of single-clutch box that the 451 uses, and it has the same characteristics: it pauses at every upshift, and the actuator is a long-term wear item. Lift off the throttle a beat before each upshift, the same way you would in a stick shift, and the harshness eases off significantly. If the dashboard ever shows lost gear position or refuses to engage, search the 451 forum content on "three-bar" reteach procedures — the same brake-pedal trick often works on softouch boxes. If you have the 5-speed manual instead, ignore all of this.
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Confirm fluid levels and quality
Engine oil to Mitsubishi 4G-series spec (most owners run a quality 5W-30), coolant to the original spec (don't mix red MB-style coolant into a Mitsubishi green system without a full flush), brake fluid (DOT 4), and gearbox fluid for the softouch or manual. Check the timing chain on the 1.3L and 1.5L engines if you're past 100,000 km — these chains stretch and they're a known weak point.
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Find the service history
Ask the seller for the maintenance booklet. Watch for missed oil intervals, missing coolant changes, and any sign that timing-chain stretch was diagnosed but ignored. The 454 is now 18+ years old, so a clean booklet is rarer than it used to be — be realistic about what you'll find. Mitsubishi-trained technicians can read the platform fluently; Smart/Mercedes specialists sometimes struggle with it.
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Check for rust honestly
The 454 is body-on-Tridion like other Smarts but the steel panels and subframes age the way any 18+ year old EU hatch does. Look at the rear wheel arches, the inner sills, the rear subframe mounts, the spare wheel well, and the boot floor. UK and Northern European cars have seen road salt; Mediterranean and AU-imported cars are usually cleaner. A clean shell is worth a paid pre-purchase inspection.
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Find an indie who knows the platform
The best mechanic for a 454 is a Mitsubishi specialist who has heard of Smart, not a Mercedes specialist who has heard of Mitsubishi. Most of what you'll fix on this car comes out of the Colt parts catalog. Independent Smart/Mercedes shops can do it but the labour rates are higher and the parts are more expensive than they need to be. The [Mechanic Directory](/mechanic-directory/) is North-America-skewed; for 454 work, the smart-club.co.uk shop list and local Mitsubishi specialists are more useful.
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Take a baseline scan
A generic OBD2 scan tool reads the 454 better than it reads other Smarts, because the engine and transmission management is Mitsubishi-flavored. A Foxwell NT530 or iCarsoft MB v4.0 with the Smart software adds the SAM and airbag modules that a basic scanner can't see. Pull all modules once, save the report, and you have a starting point.
Join the communities
Smart left North America in 2019. The communities below are how owners keep these cars on the road today — tribal knowledge, shop recommendations, parts swaps. Join two or three and lurk for a week before posting.
Global
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Evilution.co.uk
Forum
The deepest enthusiast-run Smart resource on the web. Coverage on the 454 is lighter than for the 450/451/453, but the technical writing style and the underlying methodology apply. Worth subscribing.
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smartcarforums.com
Forum
Long-running multi-region forum. The 454 archive is small but the search index turns up useful threads when you know what to look for.
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@SmartCarVideos (this site)
YouTube
670+ curated videos organized by generation and job type. 454 content is a small slice but the curation is honest about what's relevant.
North America
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No North American 454 community
note
The Forfour was never sold in North America, and the 454-specific community here is effectively zero. Smart Car of America is the regional forum but you won't find 454 owners in volume. Reach out to UK and EU groups instead.
UK & Europe
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smart-club.co.uk
Forum
UK-focused, with a dedicated 454 sub-forum. The single best English-language community for this chassis. Active long-time owners, indie shop recommendations, parts cross-references with the Mitsubishi Colt.
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Smart Car Owners UK (Facebook)
Facebook
login required — worth it
Login required, worth it. Mixed-chassis but the 454 owners who post here tend to be hands-on and helpful.
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Mitsubishi Colt forums (UK / EU)
Forum
Underrated tip: the Colt community knows the 454's mechanicals better than the Smart community does. Search the Colt forums for engine and gearbox issues — the answers usually translate directly.
Australia
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Smart Car Australia (Facebook)
Facebook
login required — worth it
Login required, worth it. AU 454s are scarce but the group is mixed-chassis and helpful for local parts sources.
Watch this stuff before you wrench
A handful of videos that'll save you an afternoon — @SmartCarVideos first, then the deep enthusiast channels.
Top maintenance items
The owner-friendly jobs that keep this chassis running. Each card is a deeper guide on this site.
Common problems & what to watch
The things that actually fail on this chassis. Cards link to deep guides with cheap-first checks and parts pricing.
Recalls
Recall repairs are free at any Smart-authorized Mercedes dealer regardless of how many owners back the campaign was issued. Look up your VIN below.
Outside the US?
The NHTSA database only covers US-market Smarts. For other regions:
Buying one? Look at these first.
Known weak points
- Timing chain stretch on the 1.3L and 1.5L 4-cyl engines. The Mitsubishi 4G15 and its derivatives use a timing chain that stretches with mileage. Once it does, it can rattle on cold start, throw cam/crank correlation faults, and in the worst case skip a tooth. Most owners report the symptom showing up between 100,000 and 160,000 km. A chain, tensioner, and guide kit is widely available through the Mitsubishi parts channel and the labour is moderate. Don't ignore a cold-start rattle on a 454 — it's the chain talking.
- Water pump failure. The Mitsubishi-sourced water pump on the 1.3 and 1.5 engines is a known wear item past 100,000 km. Failure mode is usually a slow coolant weep at the pump housing, sometimes audible bearing noise. Pump and gasket are inexpensive parts; the labour is straightforward for a 4G-experienced shop. Catch it early.
- Softouch automated manual actuator wear. If your 454 has the 6-speed softouch box (not the 5-speed manual), the actuator that operates the clutch wears out the same way it does on the 451. Symptoms: shifts that get progressively harsher, occasional missed gears, dashboard gear-position warnings. A teach-in procedure can buy time. Eventually the actuator needs servicing or replacement. If you have the option, the 5-speed manual is the more rewarding car to own long-term.
- Front timing cover oil leaks. Owners report oil seeping at the front timing cover on the 1.3 and 1.5 engines as the gasket ages. It's a slow weep, not a sudden failure, but it gets worse over time and can drip onto the alternator or accessory drive. Resealing the cover is a Saturday DIY for the comfortable, a half-day at an indie shop otherwise.
- Evap canister and fuel system age. Eighteen-plus year-old evap systems crack, the canisters absorb water, and the purge solenoids stick. Symptoms range from a faint fuel smell on a hot day to check-engine codes for evap leaks. Parts are cheap through the Colt catalog. Don't chase a generic OBD evap code by reading Mercedes-spec writeups — read the Colt-side advice instead.
- SAM module and Mitsubishi-Mercedes electronics handoff. The SAM (Signal Acquisition Module) on the 454 sits at the awkward edge of Mitsubishi engine management and Mercedes body electronics. A few electrical quirks live here that aren't in the Colt and aren't in other Smarts: certain warning lamps that misbehave, a couple of CAN-bus translation oddities. Most fixes are documented in the smart-club.co.uk archive. A Mitsubishi-only specialist may not recognize them — you may need to walk them through what a SAM is.
- Suspension bushings and steering rack age. Eighteen-year-old EU hatches all need bushings refreshed at some point. The 454 isn't worse than its peers but it's not better either. If the steering wanders, the front end clunks over expansion joints, or the rear feels sloppy, you're due for a bushing refresh. Mitsubishi-side parts are inexpensive.
Pre-purchase test drive checklist
- Cold-start the car yourself. Listen for timing-chain rattle in the first five seconds — the single most expensive thing a 454 can hide.
- Pop the bonnet and look at the front timing cover. Oil sheen there is a sign the cover gasket is weeping.
- If it's a softouch, drive in stop-and-go from 5–25 mph. Watch for harsh shifts, hesitation, or gear-position warnings. If it's a manual, do a full clutch-pedal range check and a stall test.
- Check the water pump area for any sign of coolant residue or staining on the block. Caught early it's a cheap fix; missed it's an overheat.
- Check the underbody honestly: rear wheel arches, inner sills, rear subframe mounts, spare wheel well. Northern European salt-belt cars need an underbody inspection on a lift, not on the driveway.
- Plug in a Foxwell NT530 or iCarsoft and pull all modules — engine, transmission, ABS, SAM, airbag. Generic OBD2 reads the engine but misses the body modules.
- Cycle every electrical accessory: windows, mirrors, all four doors' central locking, A/C, radio, panoramic roof if equipped.
- Verify VIN and engine number against the V5/registration document. Eighteen-year-old cars sometimes have replaced engines or unclear histories.
- Ask if the timing chain has been replaced and at what mileage. A car past 130,000 km without a chain replacement is one to negotiate hard on or walk away from.
- Get a Mitsubishi-side pre-purchase inspection if you can find one. They'll spot things a Smart-only shop will miss, and vice versa.
Accessories & aftermarket
Pre-filtered searches at the big vendors. We don't take a cut on these clicks today — if you'd rather we did, tell us.
Where to buy parts
Region-by-region. OEM via Mercedes is always available; the alternates below are owner-vetted.
United States
- Note: 454 was never sold in North America There is no US/Canada parts channel for the 454. If you have one in North America, you are sourcing parts from the EU/UK channels below or through a Mitsubishi Colt cross-reference.
United Kingdom
- smartmania.co.uk UK Smart specialist. Carries 454 service items and can source the Mitsubishi-cross-referenced parts.
- Mercedes-Benz UK Parts OEM-Smart-badged parts via UK MB dealer network. Expect to pay a Mercedes premium for parts that came off the Mitsubishi line.
- Mitsubishi UK dealer parts For most engine, gearbox, and chassis parts on the 454, the Mitsubishi UK channel often has the same physical part for less. Have your VIN and the cross-referenced Colt part number ready.
European Union
- AutoDoc Pan-European. Wide aftermarket catalog with EN/DE/FR/IT/ES/NL/PL UI. Strong on 454 service items because it's effectively a Colt catalog.
- Mister-Auto France-based, ships across EU. Good for the Mitsubishi-sourced engine and chassis parts.
Australia
- Mercedes-Benz Australia Parts OEM via AU MB dealer network. The 454 was never officially sold in Australia, so stocking is limited and parts are usually order-in.
- Mitsubishi Australia parts For the engine, gearbox, and most chassis parts, the Mitsubishi Colt parts channel applies and is more accessible than the Mercedes channel.
Find a Smart-experienced mechanic
Curated directory of 130+ shops across the US, Canada, UK, and Europe that actually work on Smarts — not just every Mercedes dealer that took the franchise. The map is owner-recommended, vetted before listing, and updated as shops open and close.
Stuck? Ask SmartDiag-AI.
Tell SmartDiag what your Forfour (454, 1st gen) is doing — or paste a code. It'll work the cheap-first checks with you, weight likely causes against community-known patterns, and cite the workshop manual for each suggestion. The link below pre-fills your chassis.
Frequently asked questions
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Is the 454 actually a Smart?
Yes and no. It carries the Smart badge, it was sold through Smart dealers, and it has Smart-specific styling and interior elements. But mechanically it's a Mitsubishi Colt — same platform, same engines, same gearboxes, same suspension geometry, built on the same line at NedCar in the Netherlands. If you treat it as a Colt with a Smart body kit, you'll get the maintenance right. If you treat it as a Mercedes-engineered Smart, you'll pay too much for parts and labour. -
Was the 454 ever sold in the US or Canada?
No. The Forfour name never crossed the Atlantic in either generation — the 454 (2004–2006) and the 453 Forfour (2014–2021) were both EU/UK-only. North American Smart buyers got the Fortwo and only the Fortwo. Under the US 25-year import rule, the earliest 454s become eligible for legal US import in 2029. -
How does the 454 compare to a 451 Fortwo for ownership?
Cheaper to maintain on average — the Mitsubishi-sourced parts are less expensive than Mercedes-spec parts for the 451's M132. More forgiving on fuel — petrol variants run on regular 95 RON instead of 98. Bigger and more practical with four doors and a proper boot. But it doesn't feel as Smart, the steering is more conventional hatch than urban runabout, and the cabin doesn't have the Tridion-cell character. If you wanted a four-door city car, the 454 is the better tool. If you wanted the Smart experience, the Fortwo delivers it more honestly. -
Should I avoid the softouch gearbox?
If you have the choice, the 5-speed manual is the more pleasant 454 to own long-term. The softouch shares the single-clutch automated-manual issues of the 450/451/452 mta — actuator wear, shift pauses, occasional position-sensor faults. Plenty of softouch 454s are still on the road, and the cost of ownership isn't catastrophic, but the manual is more rewarding to drive and has fewer moving parts to age out. -
Where do I find parts when my Mercedes dealer can't help?
Cross-reference everything to the Mitsubishi Colt 2004–2006 parts catalog. Most engine, gearbox, suspension, and chassis parts on your 454 carry Mitsubishi part numbers. AutoDoc and Mister-Auto cover this in EU. UK Mitsubishi dealers will often source parts faster and cheaper than the Mercedes-Benz UK channel for anything mechanical. The Smart-badged trim and electronics (SAM, dashboard, badging) are the only items where you genuinely need the Mercedes parts channel. -
Is the Brabus 1.5T 454 worth chasing?
If you find a clean one, yes — they're rare and they're surprisingly quick. The Brabus 1.5T puts out around 177 hp in a sub-1,200 kg shell and goes properly hard. But production was tiny and many of the surviving cars have been driven hard. Get a marque specialist inspection before committing, and budget for sport-suspension refresh and brake-system maintenance. -
Why did Smart kill the Forfour after 2006?
Sales never met the volume Mercedes hoped for, the partnership economics with Mitsubishi shifted, and the brand pivoted back to the Fortwo as its core product. The Forfour name then sat dormant from 2007 to 2014 — there is no Smart Forfour for those years — until the 453 Forfour arrived on the Renault Twingo III platform with a completely different formula. The 454 and the 453 Forfour are unrelated in everything but name.