UK Reliability Directory

Smart Forfour (454)

Production Years: 2004 - 20063 Documented Faults

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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Common Faults & Reliability

These are the most common documented problems for the Smart Forfour (454), sorted by their typical impact and frequency.

Clutch Actuator Failure

high severity

The automated manual gearbox uses an electric actuator that can fail, leaving the car unable to select gears.

Est. repair cost:£400–£800

Rear Wheel Bearing Failure

medium severity

Rear bearings are a known weak point and can start to drone or hum.

Est. repair cost:£150–£300

Front Suspension Wear

medium severity

Wishbone bushes and anti-roll bar links wear out, leading to knocks and poor handling.

Est. repair cost:£150–£400

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