Used car guide

2004 Smart City: common problems and MOT failures

What MOT testers find on the Smart City first registered in 2004: we looked at the 2,009 MOTs these cars had during 2023–2025. Plus known faults and what to look at before you buy one.

2,009MOTs of 2004 cars, done in 2023–2025
62%pass first time (all 2004 cars: 57%)
3,400typical miles a year
2.1×the usual rate for washers

What goes wrong more than usual on a 2004 Smart City?

Parts flagged at MOT more often on the 2004 Smart City than on all cars registered in 2004.

  • Washers2.1× usual
    Smart City
    8.1% All 2004 cars
    3.8%

    Failed outright at MOT: 8.1%, against 3.8% of all 2004 cars. The rest were advisories or minor defects.

    Rough price £15–£60 our estimate

    At the viewing: Test the wipers and washers on every speed.

  • Exhaust emissions (catalyst)2.5× usual
    Smart City
    6.4% All 2004 cars
    2.6%

    Failed outright at MOT: 6.3%, against 2.5% of all 2004 cars. The rest were advisories or minor defects.

    Rough price £175–£900 (catalytic converter) ClickMechanic

    At the viewing: Look for smoke when revving the warm engine and for engine or DPF warning lights.

  • Side repeaters2.4× usual
    Smart City
    4.6% All 2004 cars
    1.9%

    Failed outright at MOT: 2.1%, against 1% of all 2004 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

Better than most

Suspension arm bushes and joints: 4.4% here, against 9.4% of all 2004 cars. Rust around suspension or steering mountings: 1.2% here, against 6.1% of all 2004 cars.

Common 2004 Smart City MOT failures and advisories

The share of 2004 Smart City MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Lights and electrics
    36% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Brakes
    36% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Suspension
    33% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Tyres
    25% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Oil and fluid leaks
    14% of testsRough price £80–£600

    At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.

  • Wipers, windscreen and mirrors
    14% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

Questions to ask the seller before buying a 2004 Smart City

Ask before you travel to see it. A seller who knows the car will have answers, and receipts.

  1. Any recent work on the washers? (Flagged at MOT 2.1× as often on the 2004 Smart City as on other cars the same age.)
  2. Any recent work on the exhaust emissions (catalyst)? (Flagged at MOT 2.5× as often on the 2004 Smart City as on other cars the same age.)
  3. Any recent work on the side repeaters? (Flagged at MOT 2.4× as often on the 2004 Smart City as on other cars the same age.)
  4. Can I see the service history and receipts for any big jobs?

Looking at a Smart City?

Check the actual car: its own MOT history, mileage and what to ask the seller. Free, no sign-up.

Other years

Every year of the Smart City compared

YearMOT testsMost flagged
2012151Brakes 33%
2011138Brakes 28%
2010247Brakes 34%
2009372Suspension 30%
2008286Brakes 36%
20071,377Suspension 40%
20061,686Suspension 38%
20051,112Suspension 39%
20032,776Lights and electrics 38%
20021,864Lights and electrics 39%
2001524Brakes 35%
2000186Lights and electrics 40%

Where this comes from: the DVSA's anonymised results for every MOT test done in Great Britain during 2023–2025, counting the MOTs of Smart City cars first registered in 2004. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score