Used car guide

2018 Hyundai I800: common problems and what to check

What gets flagged at MOT on 2018 Hyundai I800s, from 1,181 tests in 2025, plus known faults and what to look at before you buy one.

1,181MOT tests in 2025
66%pass first time (all 2018 cars: 81%)
10,800typical miles a year
8.1×the usual rate for number plate lights

What stands out

Parts flagged at MOT more often on 2018 Hyundai I800s than on all cars registered in 2018.

  • Number plate lights8.1× usual
    Hyundai I800
    14.6% All 2018 cars
    1.8%

    Failed outright at MOT: 5.8%, against 0.6% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £5–£40 our estimate

    At the viewing: Check the number plate lights work and the plates are clean and legal.

  • Sidelights14.6× usual
    Hyundai I800
    10.2% All 2018 cars
    0.7%

    Failed outright at MOT: 10.1%, against 0.6% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

  • Headlight aim6.2× usual
    Hyundai I800
    10.6% All 2018 cars
    1.7%

    Failed outright at MOT: 10.6%, against 1.7% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £20–£60 our estimate

    At the viewing: Park facing a wall at night or in a garage and check both headlight beams sit level. Aim is a cheap adjustment.

  • Headlights6.5× usual
    Hyundai I800
    7.2% All 2018 cars
    1.1%

    Failed outright at MOT: 6.9%, against 1% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £40–£400 our estimate

    At the viewing: Check both headlights on dipped and full beam, and look for cloudy or cracked lenses.

  • Engine warning light4.7× usual
    Hyundai I800
    5.2% All 2018 cars
    1.1%

    Failed outright at MOT: 5.2%, against 1.1% of all 2018 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

By area

The share of 2018 Hyundai I800 MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Lights and electrics
    32% 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
    26% 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.

  • 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.

  • Wipers, windscreen and mirrors
    9% of testsRough price £15–£250

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

  • Seats and seatbelts
    6% of testsRough price £80–£250

    At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.

  • Suspension
    4% 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.

Looking at a Hyundai I800?

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Other years

YearMOT testsMost flagged
20191,829Lights and electrics 27%
20171,326Lights and electrics 37%
20161,017Lights and electrics 42%
2012904Brakes 49%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2018 Hyundai I800s registered in 2018. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score