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2012 Smart Fortwo (451)

Browse our directory of 2012 Smart Fortwo (451) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.

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Showing registrations 1–40 of 309 for the 2012 Smart Fortwo (451). Select any plate for an instant vehicle history check.

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Common Problems & Reliability

2
Serious
1
Moderate
0
Minor

The 2012 Smart Fortwo (451) has 3 known issues. 2 of these are classified as serious faults that could be expensive to repair. 1 are moderate concerns worth inspecting before purchase.

MHD Drive Belt Failure

Serious

The Mild Hybrid Drive system uses a belt to start the engine and drive the water pump. If the belt snaps, the engine will overheat almost instantly, often warping the head.

Symptoms: Battery light on dash, Engine temperature warning...

Est. repair cost: £200 (belt) to £2,500 (engine rebuild)

SAM Unit Corrosion (Water Ingress)

Serious

In the UK, water can enter the cabin via the door seals or heater intake and track down to the SAM unit (located in the passenger footwell).

Symptoms: Lights coming on by themselves, Dead battery...

Est. repair cost: £500–£1,000

Clutch Actuator Failure

Moderate

The actuator that operates the clutch can seize or wear out, leading to jerky gear changes or failure to select drive.

Symptoms: Jerky pull-away, Slow gear changes...

Est. repair cost: £300–£600

View detailed Smart Fortwo (451) fault guide

Buying Tips for the 2012 Smart Fortwo (451)

  • Check the automated manual gearbox for hesitation; while improved, the clutch actuator still requires periodic electronic adjustment and lubrication.
  • Listen for a rattling noise on startup from the 1.0-litre Mitsubishi engine, which can indicate timing chain wear on high-mileage examples.
  • Inspect the panoramic roof (if fitted) for crazing or cracking in the polycarbonate material.
  • Check the operation of the air conditioning; condenser failures are common due to stone damage at the front of the car.
  • Look for dampness in the boot area, as the rear window seals can leak over time.

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