Generations
R452 — First Generation Roadster
2003–2007
0.7 Turbo
Top issues to watch for
The most serious Smart (mcc) Roadster problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Brake hose deterioration (R452)
The Roadster's flexible brake hoses are exposed to road debris and weather due to the car's low stance and minimal body protection. MOT data shows this model fails at 15.4 times the fleet average for brake hose damage, with the problem worsening over recent years. Hose failure can cause sudden brake fluid loss and complete brake system failure, making this a critical safety issue.
What happens if ignoredBrake hose failure causes immediate loss of braking ability on the affected wheel circuit. Complete hose rupture can drain the brake fluid reservoir within seconds, potentially causing total brake failure. The car should not be driven if brake hose deterioration is suspected. Replacement of all four flexible hoses is typically recommended when one fails.
Independent garage
£150–£300
Specialist
£200–£350
Main dealer
£300–£500
Parts only
£80–£120
Dangerous
Brake pipe corrosion (R452)
The Roadster's exposed brake pipe routing and minimal underbody protection make the metal brake lines particularly vulnerable to corrosion. MOT data shows this model fails at 5.4 times the fleet average for brake pipe corrosion, with failures occurring even at lower mileages from 20,000 miles. The problem is worsening year-on-year, likely due to the age of remaining vehicles and increased winter salt use.
What happens if ignoredCorroded brake pipes can fail suddenly under pressure, causing complete loss of braking on the affected circuit. Even minor corrosion can lead to brake fluid contamination and reduced braking efficiency. Pipe failure typically requires renewal of affected sections or complete brake line replacement, often requiring body-off access on the Roadster.
Independent garage
£200–£500
Specialist
£300–£700
Main dealer
£500–£1,000
Parts only
£50–£150
Major
Suspension component corrosion and damage (R452)
The Roadster's exposed chassis design and low ground clearance make suspension components particularly vulnerable to corrosion and impact damage. MOT data shows this model fails at 21.6 times the fleet average for suspension component damage or corrosion, with the highest failure rates between 40,000-60,000 miles. The front lower control arms and their mounting points are most commonly affected, along with subframe corrosion where salt and debris accumulate.
What happens if ignoredSeverely corroded suspension components can fail suddenly, causing loss of control. Structural subframe corrosion is particularly dangerous and expensive to repair. Minor corrosion can be treated but advanced cases require component replacement at £200-600 per arm plus labour.
Independent garage
£300–£800
Specialist
£400–£1,000
Main dealer
£600–£1,500
Parts only
£150–£400
Major
Shock absorber bush excessive wear (R452)
The Roadster's firm sports suspension and limited wheelbase place high loads on shock absorber mounting bushes. MOT data shows this model fails at 16.7 times the fleet average for shock absorber bush wear, with the problem worsening over recent years. The rear shock absorber top mounts are particularly prone to failure, causing handling deterioration and potentially unsafe suspension geometry.
What happens if ignoredWorn shock absorber bushes cause poor handling, increased stopping distances, and uneven tyre wear. Complete bush failure can allow the shock absorber to move excessively, potentially causing damage to other suspension components or the body shell. Replacement typically requires specialist spring compressor tools.
Independent garage
£200–£400
Specialist
£250–£500
Main dealer
£400–£700
Parts only
£80–£150
1 more known issues tracked
Including wear items, electrical niggles, and generation-specific problems. Check a specific car to see which issues apply to its age and mileage.
Check a specific car →MOT failure hotspots
Based on DVSA MOT test data. These are the items where the Smart (mcc) Roadster fails at a significantly higher rate than the average car.
Light unit fault
Lights & Electrics · 0-20k miles
MOT failure rate: 48x the fleet average
Sample: 107 tests
Electrical wiring fault
Lights & Electrics · 40-60k miles
MOT failure rate: 26x the fleet average
Sample: 544 tests
Wheel bearings worn
Suspension · 20-40k miles
MOT failure rate: 23x the fleet average
Sample: 209 tests
Suspension component damaged or corroded
Suspension · 40-60k miles
MOT failure rate: 22x the fleet average
Sample: 544 tests
ABS fault
Suspension · 120-150k miles
MOT failure rate: 17x the fleet average
Sample: 293 tests
Brake hoses perished or damaged
Brakes · 40-60k miles
MOT failure rate: 15x the fleet average
Sample: 1,002 tests
Buying a Smart (mcc) Roadster?
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Related
Smart (mcc) Roadster reliability FAQs
What are the most common problems with the Smart (mcc) Roadster?
The Smart (mcc) Roadster has 5 known issues across 2 severity levels. The most serious are: Brake hose deterioration (R452), Brake pipe corrosion (R452).
Is the Smart (mcc) Roadster reliable?
The Smart (mcc) Roadster has 2 dangerous and 3 major known issues. Most can be avoided with a thorough pre-purchase check and full service history.
How much does it cost to fix Smart (mcc) Roadster problems?
Repair costs range widely. The most significant issue (Brake hose deterioration (R452)) costs £150–£300 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.