Smart Forfour 454 (2004–2006) — What This Site Covers and Where to Look
Service interval: No interval — this is a reference and orientation page, not a procedure
Fluids & specs
No fluids or capacities apply to this procedure.
Torque specs
No workshop-manual-verified fastener torques are linked to this procedure. If a fastener needs a torque spec, refer to the workshop manual for your model and year.
What this is and why it matters
The 454 is the first-generation Smart Forfour (model 454.0). Our corpus holds it as a distinct chassis inside the shared 450/451/452/454 workshop manual, but — being honest up front — the owner-facing reference depth this site has for the Fortwo and the Roadster is not yet here for the 454. This page is deliberately thin: it grounds what we can actually verify, points you to the shared coverage that applies, and is clear about what we don't hold rather than filling the gap with guesswork. There are no fasteners or fluids handled on this page; it's orientation, not a procedure.
What our corpus actually covers for the 454
The workshop manual carries 454.0-specific component data, and one distinction matters more than the rest:
- Rear brakes are split by build code. A 454.0 fitted with code 30Y has rear disc brakes; without that code it has rear drum brakes (the exception being model 454.033) [smart 450/451/452/454 workshop manual]. This changes the rear-brake service completely, so it's the first thing to establish on any given 454 before you order parts or start work.
- Drum-braked cars need the rear brake-shoe lining thickness checked and the drum and handbrake adjusted as part of service [smart 450/451/452/454 workshop manual].
- The 454.0 has its own wheel-bolt and brake torque and check-value specifications in that manual, distinct from the other chassis.
Where to look
Because the 454 shares the 450/451/452/454 workshop manual, the multi-chassis pages on this site that list 454 in their scope apply to it — start with those rather than the Fortwo-only guides:
- 12V Battery Replacement — covers all chassis including the 454.
- Manual Transmission Fluid — scoped to the 452/453/454.
- For the Roadster sibling that shares much of the running gear, the 452 pre-purchase inspection is a useful adjacent read.
Common gotchas
- Establish the rear-brake build code before you order 454 brake parts. Code 30Y means rear discs; without it, rear drums (except model 454.033) [smart 450/451/452/454 workshop manual]. Ordering for the wrong setup is the classic 454 mistake.
- Don't trust a manual by its filename. A widely-circulated "454 owner manual" is actually the modern 453 Forfour — confirm the equipment matches a 2004–2006 car before you rely on it.
- Use the 454's own specs, not the Fortwo's. The 454 shares the workshop manual with the other chassis but carries its own 454.0 torque and check values — read the 454 column, not a neighbouring one.
What we don't hold yet
This is the honest gap, logged for corpus acquisition rather than papered over: owner-facing 454 content — the engines and platform, the model history, the service intervals, and step-by-step 454 procedures — is not in our corpus. We won't reconstruct it from general knowledge, because an unsourced "fact" on a maintenance page is worse than an acknowledged gap.
One note on sources, for transparency: a file in our holdings labelled as a "454 owner manual" is, on inspection, the modern second-generation 453 Forfour manual (it references equipment — i-Size child seats and the like — that the 2004–2006 car never had). We've deliberately excluded it from this page so we don't attribute the wrong car's content to the 454; it's flagged for relabelling. When a genuine 2004–2006 454 owner or maintenance manual is acquired, this page fills in.
Parts & typical prices
| Part | OE / part # | Typical price | Find |
|---|---|---|---|
| None — orientation page; no part is fitted here. 454-specific OE numbers are not in our sources. | — | N/A | Parts finder → |
OE numbers come from the workshop manuals and the parts catalog (genuine Mercedes / Renault); confirm against your VIN before ordering. Prices are rough community-reported ranges, not quotes — aftermarket vs. genuine swings the spread.
Manual references
- Browse Smart manuals on smartcarmanuals.com — full catalog of 88 manuals filterable by chassis, year, region, or document type.
Stuck mid-procedure?
SmartDiag-AI walks through this kind of job with you, weighted to community-known patterns for your exact model. The link below opens the chat with this topic and your chassis pre-loaded.
Ask SmartDiag-AI about smart forfour 454 (2004–2006) — what this site covers and where to look