The MOT Files

Known faults, from the test record

Hyundai I800 common problems

What fails on the Hyundai I800 at MOT, which parts are behind it, and how each model year compares. From 7,916 DVSA test records.

Data updated

Quick answer

The Hyundai I800's most common MOT problems are bulbs and lamps, parking brake, headlamp aim, recorded in 64.3%, 32.3% and 28.0% of failed tests respectively. By model year, 2019 cars pass most often (71.9%) and 2016 cars least (57.8%), though most of that gap is age. Every figure here is what testers recorded, not what owners reported.

A “common problems” list is usually a forum thread: whoever had the worst day writes the longest post. This one is built the other way, from every Hyundai I800 that took an MOT last year and what the tester wrote down. It cannot see breakdowns, electrical gremlins or a gearbox that hunts, because the test does not check those. What it can see, it sees across 7,916 cars.

By component

What wears out on a I800

Failure items grouped by the part behind them, with the share of failed Hyundai I800 tests recording each. A part can carry several DVSA wordings; they are listed beneath. One failed test often lists several items, so shares do not sum to 100%.

  1. 1.Bulbs and lamps

    64.3% of failed tests

    Filament bulbs simply expire; the cheapest and most avoidable failure on the test, and one of the most recorded.

    • “A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained25.5%
    • “A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED” — explained14.3%
    • “A rear registration plate lamp or light source missing or inoperative in the case of a single lamp or all lamps” — explained13.8%
    • “Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning” — explained7.0%

    Across all cars, bulbs and lamps failures climb 15-fold between three and fifteen years, peaking at 15+ years. How long bulbs and lamps last

  2. 2.Parking brake

    32.3% of failed tests

    Cables stretch and seize, rear shoes and adjusters wear; efficiency is measured on the roller tester against the vehicle's weight.

    • “Parking brake efficiency below minimum requirement” — explained13.1%
    • “Parking brake inoperative on one side” — explained10.7%
    • “Parking brake efficiency less than 50% of the required value” — explained4.8%
    • “Parking brake lever has excessive movement indicating incorrect adjustment” — explained3.8%

  3. 3.Headlamp aim

    28.0% of failed tests

    Aim drifts with sagging suspension, a knocked lamp or a botched bulb change; adjustment, not a part.

    • “The aim of a headlamp is not within limits laid down in the requirements” — explained14.6%
    • “The aim of a headlamp is not within limits laid down in the requirements” — explained6.0%
    • “Headlamp aim unable to be tested” — explained3.8%
    • “The aim of a headlamp is not within limits laid down in the requirements” — explained3.5%

  4. 4.Tyres

    21.6% of failed tests

    Tread wears with every mile and sidewalls age and take kerb damage; the legal minimum is 1.6 mm across the central three-quarters.

    • “Tyre tread depth not in accordance with the requirements” — explained11.1%
    • “A tyre seriously damaged” — explained5.7%
    • “A tyre cords visible or damaged” — explained4.8%

    Across all cars, tyres failures run at a similar rate at every age, because they are replaced on a cycle rather than wearing out with the car. How long tyres last

  5. 5.Suspension bushes

    21.2% of failed tests

    Rubber bushes in arms and links perish and split with age and load; the most recorded suspension item on the test.

    • “A suspension pin, bush or joint excessively worn” — explained7.8%
    • “A suspension pin, bush or joint excessively worn” — explained6.3%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained2.8%
    • “A suspension joint dust cover missing or no longer prevents the ingress of dirt etc” — explained2.2%

    Across all cars, suspension bushes failures climb 20-fold between three and fifteen years, peaking at 15+ years. How long suspension bushes last

  6. 6.Wiper blades and washers

    16.5% of failed tests

    Rubber blades harden and split within a year or two; washer jets block and pumps fail.

    • “Wiper blade missing or obviously not clearing the windscreen” — explained8.7%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained4.5%
    • “Windscreen washers not working or not providing sufficient fluid to clear the windscreen” — explained3.2%

    Across all cars, wiper blades and washers failures run at a similar rate at every age, because they are replaced on a cycle rather than wearing out with the car. How long wiper blades and washers last

  7. 7.Brake pads and shoes

    12.8% of failed tests

    Friction material wears with use; the MOT limit is 1.5 mm and a pad that thin is close to metal on metal.

    • “a brake lining or pad worn below 1.5mm” — explained12.8%

    Across all cars, brake pads and shoes failures run at a similar rate at every age, because they are replaced on a cycle rather than wearing out with the car. How long brake pads and shoes last

  8. 8.Engine management

    11.9% of failed tests

    The MIL lamp lit is a failure in itself, whatever the stored code; the fault codes section explains what lies behind it.

    • “Engine MIL illuminated indicating a malfunction” — explained8.7%
    • “Engine MIL illuminated indicating a malfunction” — explained3.2%

By registration year

I800 problems by year

MOT pass rate for Hyundai I800 cars by the year they were first registered, from years with at least 1,000 tests. Every car in a row is the same age, so the rate is raw. Neighbouring years differ by a year of wear — a step of a point or two is age. The step at 2017, up 6.3 points, is larger than wear explains and most likely marks a change in the cars themselves.

201658%
201764%+6.3
201866%+1.7
201972%+6.1

Last column: change on the previous year, in points. Years registered within the last three years have not yet been tested and are not shown.

Before it fails

What testers warn I800 owners about

Advisories are the same parts a year or two earlier. Share of all Hyundai I800 tests carrying an advisory for each.

Go deeper

The rest of the I800 file

Common questions

What are the most common problems with a Hyundai I800?
Going by what fails the MOT, bulbs and lamps (recorded in 64.3% of failed tests), parking brake (recorded in 32.3% of failed tests), and headlamp aim (recorded in 28.0% of failed tests). These are the items testers actually record across 7,916 tests, not reports from owners, so they describe what goes wrong at the point where it has to be fixed.
Which Hyundai I800 year is the most reliable?
By MOT pass rate, Hyundai I800 cars registered in 2019 do best at 71.9% and 2016 cars do worst at 57.8%. Most of that ordering is simply age — newer cars pass more — so read the year table for steps larger than a couple of points between neighbouring years; those mark a change in the cars rather than the calendar. The largest such step is at 2017, up 6.3 points on 2016.
Is the Hyundai I800 reliable?
Adjusted for the age and mileage of the cars tested, the Hyundai I800 passes 61.1% of MOTs against a national 72.3%. An MOT measures roadworthiness on the day rather than breakdowns or running costs, so this is a reliability measure in the narrow sense: how often the car meets the legal standard, and what stops it.
What should I check when buying a used Hyundai I800?
Start with what fails most: bulbs and lamps, tyres, suspension bushes. Then read the car's own MOT history for advisories carried year to year without repair — the model tells you what to expect, the history tells you whether this owner dealt with it.

Analysis built from DVSA data of