Hyundai i20 vs VW Polo: Which Is More Reliable? MOT Data

The i20 and Polo have been fighting for the same buyer for over a decade: someone who wants a small, sensible car that won't cause drama at MOT time. One carries a Korean badge and a warranty that used to be the industry's longest. The other carries a VW badge and the assumption, often unexamined, that German engineering means fewer problems. We pulled 5,935,528 MOT tests covering both models across their shared 2010-2020 production years to see which assumption actually holds up.

The result isn't close enough to call a tie, but it isn't a landslide either. Here's what the data shows, and what it means if you're choosing between the two on a used car forecourt right now.

Head-to-Head: The Numbers (2010-2020)

Pass Rate and Score, Year by Year

Shared years only. Hyundai i20 data also covers 2021; VW Polo data also covers 2021-2023, covered in the full year-by-year guides below.

What Actually Fails on Each

Recorded defects and advisories per 100 MOT tests by DVSA inspection category, 2010-2020. A test can record more than one defect.

The Best Year to Buy Each

Reliability scores are age-adjusted: each year is judged against other cars of the same age. So when an older year out-scores a newer one, it means it holds up unusually well for its age, not that it will need less work than a much newer car. How our scores work.

Why Does the Hyundai i20 Come Out Ahead?

The i20 wins on pass rate and on defects per test, and the pattern behind those numbers tells you something. Hyundai owners in this dataset cover noticeably fewer miles a year than Polo owners. That's not a coincidence, it's a big part of the story. A car doing gentler annual mileage accumulates wear more slowly, and wear is what fails MOTs. The Polo's slightly higher annual mileage means the average example in this sample is simply being worked harder.

The other factor is consistency. Look at the year-by-year figures and the i20 tracks a steadier upward curve as the model ages through its production run. The Polo's scores bounce around more, dipping in a few years before recovering. A car that degrades predictably is easier to buy with confidence than one where the outcome depends heavily on which exact model year you land on.

None of this makes the Polo unreliable in absolute terms. Its pass rate still sits solidly within what you'd expect from a mainstream supermini, and DVSA MOT records show both cars comfortably ahead of the industry's worst performers. The i20 is the more dependable choice, but the Polo isn't a car to be scared of.

What Do the Defect Patterns Tell You?

Both cars fail MOTs for the same basic reason: tyres, wheels and suspension. That's true of almost every supermini on UK roads, and it mostly reflects how these cars are used (short urban trips, kerbed alloys, potholes) rather than any inherent design flaw. But the scale of the gap here is worth noting. The Polo's rate of chassis-related defects is meaningfully higher than the i20's, while the i20 shows a higher brake defect rate than the Polo.

Read together, this suggests the Polo's suspension and steering components take more of a battering over time, plausibly linked again to the higher mileage those cars tend to rack up, while the i20's brake wear pattern is the more common weak point to budget for. Neither is a dealbreaker. Both are wear items any used buyer should check regardless of make: tyre condition, uneven wear suggesting tracking issues, and brake disc/pad life at the point of purchase.

Electrics run close between the two, so don't expect one to be dramatically more finicky with warning lights than the other. If anything, the data suggests the differences between these cars are mechanical and mileage-driven rather than electronic. That's reassuring either way.

Which Years Should You Avoid on Each Model?

Age-adjusted scoring changes the picture from what a simple pass-rate table would suggest. For the i20, the early-to-mid production years score noticeably lower once you account for the fact that older cars are naturally compared against a tougher benchmark, and a couple of those years sit well below where you'd expect. The car improves sharply from the mid-2010s onward, and the standout year holds up unusually well for its age relative to the vehicles around it. That doesn't mean it needs any less maintenance than a genuinely newer car, though.

The Polo tells a similar story with its own wrinkles: a few years land clearly below the pack even after adjusting for age, and buyers should treat those as ones to inspect harder rather than avoid outright, since a bad score is a statistical pattern, not a guarantee of an individual car's condition. As with the i20, the newest years in this shared window score best, and if you can stretch to an even newer Polo outside this window, the data suggests it's worth the extra spend.

We've broken both of these down in full detail, year by year, with the reasoning behind each score. See our full Hyundai i20 year-by-year breakdown and our full VW Polo year-by-year breakdown before you commit to a specific plate.

Which Car Suits Which Buyer?

If you're buying on reliability data alone, the i20 is the safer bet, and its long warranty (seven years when new from Hyundai, though this varies by age and transferability on used examples) adds a layer of protection the Polo never offered from new. For a buyer prioritising low running risk and a car that's likely to sail through its MOT with minimal fuss, the i20 is the more rational choice. Its lower typical annual mileage in this dataset suggests it also tends to attract gentler, lower-intensity ownership.

The Polo still has a case. Its cabin quality, resale value and badge appeal on the used market are generally stronger, according to What Car? owner satisfaction data, and for buyers who value that German-badge solidity and don't mind slightly more attention to suspension components, it remains a perfectly sound choice. It's also worth checking Auto Trader listings, since Polo values tend to hold up well, which matters if you plan to sell on in a few years.

As a first car for a new driver, the i20's lower defect rate and gentler typical mileage make it the pragmatic pick, especially paired with cheaper parts and servicing that tend to come with the Korean badge. Whichever you choose, always run a check through gov.uk's MOT history tool on the specific car in front of you. Individual history beats model averages every time.

Frequently Asked Questions

Model averages tell you what to expect in general. They don't tell you about the specific i20 or Polo sitting on a forecourt with your name on it. Before you hand over a deposit, run its plate through PlateInsight. You get 5 free credits to check full MOT history, mileage patterns and past defects on any car you're considering.