What goes wrong, what it costs, and what to check before you buy a used Smart Fortwo Passion 71.
The Smart Fortwo Passion 71 occupies a niche position on the UK market.
We track 5 known issues across the Smart Fortwo Passion 71 range, including 1 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Smart Fortwo Passion 71? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
C451 (2007–2014) — Engine options included the 1.0L MHD. Our database flags 5 known issues on this generation, 1 of which are rated as safety-critical. The most significant concern is Brake pipe corrosion and damage (£300–£600 to address).
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.
Brake 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.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
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.
Binding 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.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
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.
Fuel 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.
Check for fuel smells around the engine bay and underneath the car. Look for staining or wetness around fuel lines and connections. Injector issues may cause rough running or misfires that are most noticeable at idle.
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.
A 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.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
The Smart Fortwo uses an automated manual transmission system with an electric clutch actuator instead of a traditional clutch pedal. This actuator motor is known to fail, particularly in stop-start city driving conditions that the car is designed for. Failure symptoms include harsh gear changes, inability to engage gears, or the transmission getting stuck in gear. The actuator is a Smart-specific component that requires specialist diagnosis and calibration after replacement.
Complete actuator failure leaves the car unable to change gear or engage drive, requiring recovery. Partial failure causes harsh gear changes that can damage the transmission and make the car unpleasant or dangerous to drive in traffic. Replacement requires Smart-specific diagnostic equipment for calibration.
Check each gear engages smoothly without crunching. Feel the clutch bite point — very high or very low can indicate wear. Listen for bearing noise when the clutch is depressed.
For the full breakdown of all 5 tracked issues with repair costs, see the Smart Fortwo Passion 71 common problems page.
Routine servicing (oil and filter change every 10k miles) typically costs £80–£120 at an independent garage.
See the full Smart Fortwo Passion 71 service schedule for every interval and cost breakdown.
The Smart Fortwo Passion 71 has some well-documented weak points, including 1 safety-critical issue that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Smart Fortwo Passion 71, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known Smart Fortwo Passion 71 issues. We are not affiliated with any source listed.