Generations
C452 — Smart Roadster
2003–2005
0.7 Turbo
Top issues to watch for
The most serious Mcc Smart Roadster 80bhp problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Brake pipe corrosion (C452)
Brake pipes on the Smart Roadster corrode at 5.7 times the national fleet average, with 370 documented MOT failures across 2020-2024. The pipes run along the chassis rails which collect moisture and road salt. Corrosion typically starts at mounting brackets and pipe joints. This is a structural safety defect that can lead to complete brake system failure. The issue affects cars consistently across the 40-100k mile range.
What happens if ignoredCorroded brake pipes can burst without warning, leading to complete brake failure and serious accident risk. Replacement involves removing sections of the brake system and may require chassis cleaning. Repair costs £200-600 depending on the extent of corrosion. The car should not be driven if pipe corrosion is suspected.
Independent garage
£200–£400
Specialist
£250–£500
Main dealer
£400–£600
Parts only
£50–£150
Major
Shock absorber bush wear (C452)
Shock absorber mounting bushes fail at 27.5 times the national fleet average on the Smart Roadster, with peak failures occurring between 60-80k miles. The lightweight chassis design places higher stresses on suspension mounting points than conventional cars. Worn bushes cause handling deterioration and uneven tyre wear. This appears to be a design weakness specific to this model's suspension architecture.
What happens if ignoredWorn shock bushes cause poor handling, increased stopping distances, and accelerated tyre wear. The shock absorber may eventually detach from its mounting if bushes fail completely. Replacement requires specialist suspension tools. Total repair cost typically £150-400 per corner depending on access difficulty.
Independent garage
£150–£300
Specialist
£200–£400
Main dealer
£300–£500
Parts only
£30–£80
Major
Brake hose deterioration (C452)
Flexible brake hoses deteriorate at 15.9 times the national fleet average on high-mileage Smart Roadsters. The hoses become damaged, chafed, or stretched beyond safe limits. This typically occurs where hoses connect the rigid brake pipes to the brake calipers, particularly at the front wheels where steering movement stresses the hoses. Age-related rubber degradation is accelerated by the confined engine bay environment.
What happens if ignoredDeteriorated brake hoses can burst under pressure or allow brake fluid to weep, reducing braking efficiency. Complete hose failure leads to loss of braking on that wheel. Hoses should be replaced in pairs (front or rear) to ensure consistent brake performance. Cost is £100-250 including labour and system bleeding.
Independent garage
£100–£200
Specialist
£150–£250
Main dealer
£200–£350
Parts only
£40–£100
Minor
Fluid leaks (C452)
The compact engine bay and turbocharger heat create challenging conditions for seals and gaskets. Leaks typically develop from the turbocharger oil feed lines, valve cover gasket, and power steering system. While not immediately dangerous, leaked fluids can create environmental hazards and fire risks on hot components.
What happens if ignoredFluid leaks create environmental hazards and may indicate failing seals that could lead to more serious problems. Oil leaks onto the turbocharger can cause smoke and fire risk. Power steering leaks affect steering assistance. Most leaks can be traced and repaired for £100-400 depending on the source and accessibility.
Independent garage
£100–£300
Specialist
£150–£400
Main dealer
£250–£500
Parts only
£20–£100
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems.
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Related
Mcc Smart Roadster 80bhp reliability FAQs
What are the most common problems with the Mcc Smart Roadster 80bhp?
The Mcc Smart Roadster 80bhp has 5 known issues across 3 severity levels. The most serious are: Brake pipe corrosion (C452).
Is the Mcc Smart Roadster 80bhp reliable?
The Mcc Smart Roadster 80bhp has 1 dangerous and 2 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Mcc Smart Roadster 80bhp problems?
Repair costs range widely. The most significant issue (Brake pipe corrosion (C452)) costs £200–£400 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.