What goes wrong, what it costs, and what to check before you buy a used Smart Fortwo Passion MHD.
The Smart Fortwo Passion MHD occupies a niche position on the UK market.
We track 5 known issues across the Smart Fortwo Passion MHD range, including 2 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 MHD? 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, 2 of which are rated as safety-critical. The most significant concern is Brake caliper seizure and binding (£150–£300 to address).
MOT data shows this model fails at 10.9 times the fleet average for binding brakes with significant brake effort recorded when no brake is applied. The lightweight ForTwo uses relatively large brake calipers for its size, and the rear calipers are prone to corrosion and seizure. This creates a dangerous situation where one wheel drags continuously, causing overheating, reduced braking efficiency, and potential brake failure.
A seized brake caliper creates a serious safety risk through reduced braking effectiveness and potential complete brake failure due to overheating. The affected wheel can lock unexpectedly during braking. Continued driving with a binding brake will destroy the brake disc and potentially cause a brake fire. The car should not be driven until the fault is repaired.
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.
MOT data shows this model fails at 6.3 times the fleet average for brake pipe damage or excessive corrosion. The ForTwo's exposed brake lines are vulnerable to road salt and stone damage due to the car's low ground clearance and minimal underbody protection. Corroded brake pipes can fail suddenly, resulting in complete brake system failure with no warning.
Corroded brake pipes can rupture without warning, causing immediate and complete loss of braking ability. This represents an extreme safety risk with potentially fatal consequences. Any evidence of brake pipe corrosion requires immediate professional inspection. The vehicle must not be driven if pipe integrity is compromised.
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 rear-mounted 1.0L engine uses rubber mounts that deteriorate rapidly due to the engine's location and vibration characteristics. MOT data shows this model fails at 54.5 times the fleet average for severely damaged engine mountings. Failed mounts allow excessive engine movement that can damage surrounding components and create harsh vibrations through the cabin. The rear engine bay location makes replacement labour-intensive.
Completely failed engine mounts allow the engine to move excessively, potentially damaging fuel lines, exhaust connections, and electrical wiring. Vibration becomes uncomfortable and can accelerate wear of other components. Replacement requires engine support equipment and typically costs £300-600 depending on which mounts have failed.
Check all auxiliary systems during the test drive — air conditioning (both hot and cold), engine mounts (excessive vibration at idle or clunking when pulling away) and all belt-driven accessories. Listen for squealing or chirping from the belt area.
MOT data shows this model fails at 6.0 times the fleet average for fractured or seriously weakened springs. The ForTwo uses relatively stiff springs to compensate for its short wheelbase and high centre of gravity. These springs are subject to high stress loads during normal driving and are prone to fracturing, particularly at the lower coils where road salt accumulates.
A fractured spring reduces ride comfort and vehicle stability, particularly during emergency manoeuvres. Broken spring coils can damage the tyre or puncture it suddenly. Complete spring failure can cause loss of vehicle control. Replacement typically costs £200-400 per spring including labour.
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.
MOT data shows this model fails at 11.8 times the fleet average for excessively worn suspension pins, bushes, or joints. The ForTwo's short wheelbase places high loads on the suspension components during normal driving. The rubber bushes deteriorate rapidly, particularly in the rear suspension where the engine weight creates additional stress.
Worn suspension bushes reduce handling precision and comfort. They accelerate tyre wear and can lead to MOT failure. Complete failure is gradual rather than sudden, so the car remains safe to drive while arranging repair. Replacement bushes typically cost £100-300 depending on location and number requiring replacement.
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.
For the full breakdown of all 5 tracked issues with repair costs, see the Smart Fortwo Passion MHD common problems page.
Routine servicing (oil and filter change every 6k miles) typically costs £80–£120 at an independent garage.
See the full Smart Fortwo Passion MHD service schedule for every interval and cost breakdown.
The Smart Fortwo Passion MHD has some well-documented weak points, including 2 safety-critical issues 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 MHD, 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 MHD issues. We are not affiliated with any source listed.