Smart Forfour (454) Common Problems & Reliability
The first-generation Smart Forfour (Type 454) was a conventional, front-engine, front-wheel-drive supermini developed alongside the Mitsubishi Colt. It abandoned the rear-engine layout of the Fortwo to offer a spacious, four-seat cabin with sliding rear seats and quirky two-tone plastic bodywork. In the UK, it was a slow seller and is now a rare sight, mostly remembered for its Brabus high-performance version. Reliability is generally very good thanks to the Mitsubishi-sourced engines and electronics, making it a dependable, if unconventional, cheap runaround. It suits budget buyers who want a reliable, practical small car that stands out from a typical Ford Fiesta.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Smart Forfour (454) Faults & Repair Costs
Clutch Actuator Failure
The automated manual gearbox uses an electric actuator that can fail, leaving the car unable to select gears.
Stalling when stopping, Refusal to engage gear, Warning light on dash
- Ensure the actuator has been lubricated and adjusted according to service intervals
Rear Wheel Bearing Failure
Rear bearings are a known weak point and can start to drone or hum.
Droning noise from the rear that increases with speed
- Jack up the rear and spin the wheels; listen for roughness
Front Suspension Wear
Wishbone bushes and anti-roll bar links wear out, leading to knocks and poor handling.
Knocking over bumps, Car pulling to one side
- Listen for clonks during the test drive
Buying a used Smart Forfour (454)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.