Generations
C451 — Second Generation
2007–2014
1.0L MHD
Top issues to watch for
The most serious Smart Fortwo Passion 71 problems ranked by severity. We track 5 known issues — here are the ones you need to know about first.
Dangerous
Brake pipe corrosion and damage
The brake pipes on the Smart Fortwo are particularly vulnerable to corrosion due to their routing and the car's low ground clearance. The MOT data shows this model fails at 4.6 times the fleet average for brake pipe damage or excessive corrosion. This affects cars as early as 20,000 miles and spans all mileage bands through 100,000 miles. The failure rate has been worsening over the 2020-2024 period, indicating a systemic design or material issue with the brake line protection.
What happens if ignoredBrake line failure results in complete or partial loss of braking ability, creating an immediate danger to the occupants and other road users. The car should not be driven if brake line damage is suspected. Replacement of corroded brake lines typically requires removal of body panels and underbody components.
Independent garage
£300–£600
Specialist
£400–£800
Main dealer
£500–£1,000
Parts only
£50–£150
Major
Brake binding and seized calipers
The Smart Fortwo shows brake caliper seizure at 4.6 times the fleet average, particularly in the 40,000-60,000 mile range. The MOT data records significant brake effort with no brake applied, indicating binding brake components. This issue has been worsening over the 2020-2024 period. The small brake system and limited wheel space in the Smart design may contribute to heat buildup and accelerated wear of caliper seals and slider mechanisms.
What happens if ignoredBinding brakes cause premature wear of brake pads and discs, reduced braking efficiency, and potential overheating of brake components. Continued driving with seized calipers can lead to complete brake failure or fire risk from overheated components. The affected wheel may also show accelerated tyre wear.
Independent garage
£200–£400
Specialist
£250–£500
Main dealer
£300–£600
Parts only
£80–£200
Major
Fuel system leakage and filler cap issues
The Smart Fortwo demonstrates fuel system leakage at an exceptional 54.6 times the fleet average, peaking in the 60,000-80,000 mile range. This massive failure rate indicates a fundamental design or material issue with either the fuel tank, fuel lines, or filler cap system. The trend is improving, suggesting awareness of the issue, but the failure rate remains extremely high compared to other vehicles. Given the small fuel tank design and cramped packaging, access for repairs is typically difficult.
What happens if ignoredFuel leakage creates a significant fire hazard and environmental risk. Vapour buildup in enclosed spaces can create explosion risks. A faulty fuel cap also triggers the emissions system and may cause the engine management light to illuminate. The car should not be driven with suspected fuel leakage until the source is identified and repaired.
Independent garage
£100–£300
Specialist
£150–£400
Main dealer
£200–£500
Parts only
£20–£150
Major
Front coil spring fracture
The Smart Fortwo shows spring fractures at 3.1 times the fleet average, with the trend worsening over 2020-2024. This affects cars from 40,000 miles onwards across multiple mileage bands. The compact suspension design and limited spring travel in the Smart may contribute to stress concentration and premature spring failure. Front springs typically fail at the end coils where stress is highest during compression and extension cycles.
What happens if ignoredA broken spring causes the car to sit lower on one side, affects handling and stability, and can damage the shock absorber or other suspension components. Sharp spring ends can puncture tyres or damage brake lines. The car should not be driven fast or on uneven surfaces with a suspected spring failure.
Independent garage
£150–£250
Specialist
£180–£300
Main dealer
£220–£380
Parts only
£40–£80
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.
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Related
Smart Fortwo Passion 71 reliability FAQs
What are the most common problems with the Smart Fortwo Passion 71?
The Smart Fortwo Passion 71 has 5 known issues across 2 severity levels. The most serious are: Brake pipe corrosion and damage.
Is the Smart Fortwo Passion 71 reliable?
The Smart Fortwo Passion 71 has 1 dangerous and 4 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 Fortwo Passion 71 problems?
Repair costs range widely. The most significant issue (Brake pipe corrosion and damage) costs £300–£600 at an independent garage. Minor issues can be under £200. Always get a full inspection before buying.