Hyundai I800 MOT Failures
An analysis of 208,214 real DVSA MOT tests on the Hyundai I800 — what fails, how often, and how that compares to every other car on UK roads. Generations covered: H-1 (2008–2021).
Where the Hyundai I800 fails its MOT
The single biggest MOT failure point on the Hyundai I800 is body panel damage — this model is 33 times more likely to fail on this item than the average car on UK roads. That makes it a significant weak point for anyone buying or owning this model. Across 208,214 MOT tests, 0.33% of all Hyundai I800 tests recorded this as a failure.
Bodywork failures usually mean structural corrosion — not cosmetic rust, but rot that affects the car's structural integrity. Check sills, subframes, and chassis rails carefully, especially on older examples.
Other notable weak points include service brake control has insufficient reserve ... (7.5x the fleet average), seat mounting fault (8.7x the fleet average), headlight fault (34x the fleet average), and transmission shaft bearing worn (16x the fleet average). These ratios compare the Hyundai I800's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.
The failures span 5 categories: Bodywork, Brakes, Seatbelts & Airbags, Lights & Electrics, Exhaust & Emissions. If you're inspecting a Hyundai I800 before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The Hyundai I800's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
For the Hyundai I800 specifically, the DVSA data shows the most common failures at this mileage are headlight fault (24x the average) and parking brake inoperative on one side (9.4x). body panel damage (9.3x) and steering rack wear (9.1x) also appear frequently.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
For the Hyundai I800 specifically, the DVSA data shows the most common failures at this mileage are transmission shaft bearing worn (12x the average) and headlight fault (10x). seat mounting fault (8.7x) and body panel damage (8.3x) also appear frequently.
Over 100,000 miles
High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.
For the Hyundai I800 specifically, the DVSA data shows the most common failures at this mileage are body panel damage (33x the average) and transmission shaft bearing worn (9.5x). light unit fault (7.0x) and seat mounting fault (5.6x) also appear frequently.
The shift from headlight fault at lower mileages to body panel damage at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.
Known issues beyond the MOT
An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Hyundai I800 specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Transmission shaft bearing excessive wear Major
The driveshaft intermediate bearing or CV joint bearings show excessive wear leading to MOT failures. Affects H-1; typical independent garage repair cost is £200–£400.
Handbrake adjustment and efficiency issues Major
The handbrake system shows multiple failure modes including insufficient efficiency, excessive lever travel, and one-side inoperative conditions. Affects H-1; typical independent garage repair cost is £100–£250.
Service brake pedal travel issues Major
The brake pedal shows insufficient reserve travel indicating adjustment problems or air in the hydraulic system. Affects H-1; typical independent garage repair cost is £150–£400.
Door operation and closure problems
Door mechanisms fail to operate correctly, preventing doors from opening using the handle or closing properly. Affects H-1; typical independent garage repair cost is £150–£350.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Hyundai I800 common problems breakdown.
What to check before buying a Hyundai I800
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Hyundai I800:
Bodywork — check for body panel damage, transmission shaft bearing worn. Brakes — check for service brake control has insufficient reserve ..., parking brake inoperative on one side. Seatbelts & Airbags — check for seat mounting fault. Lights & Electrics — check for headlight fault, light unit fault.
Beyond the MOT items, ask specifically about transmission shaft bearing excessive wear and handbrake adjustment and efficiency issues. These won't show up on a standard MOT but can be expensive to fix — repairs start from £200. A specialist pre-purchase inspection is worth the investment on this model.
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.
Looking at a specific Hyundai I800?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
Hyundai I800 MOT FAQs
What are the most common MOT failures on a Hyundai I800?
Based on 208,214 DVSA MOT tests, the most common failure is body panel damage — at 33x the national fleet average. Other frequent failures include service brake control has insufficient reserve ... and seat mounting fault.
Is the Hyundai I800 reliable based on MOT data?
The Hyundai I800 has 11 MOT failure categories above the fleet average. Specialists also flag transmission shaft bearing excessive wear as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
Above 100,000 miles, the Hyundai I800 most commonly fails on body panel damage and transmission shaft bearing worn. Under 60,000 miles, the main issues are headlight fault and parking brake inoperative on one side.
How do I check a Hyundai I800's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.