In 2015, Hyundai started offering a five-year manufacturer's warranty on the i20 as standard. At the time, the class benchmark was three years — VW, Ford, and Vauxhall all offered three. A five-year warranty only makes commercial sense if you're confident the car won't cost you a fortune in warranty claims. Hyundai was confident. It turned out to be justified. The i20 went on to build one of the strongest reliability records in the supermini class, consistently outperforming European rivals in owner satisfaction surveys, and those warranty-period cars arrived on the used market in condition that reflected the attention they'd received under cover.
That context matters when you're choosing between an i20 and a Fiesta or Corsa at the same used price. The Fiesta is more fun to drive. The Polo feels more premium. The i20 is the one that's statistically least likely to let you down, best equipped as standard for the money, and — with the third-generation car launched in 2020 — now looks and feels like a proper contender rather than a sensible compromise. The used market hasn't fully priced this in, which means buyers who look past the badge can do very well here.
Which generation?
Two generations dominate the current used market.
The second-generation i20 (2014–2020) is the budget option. Available from around £6,000 in reasonable condition, it's an honest, dependable small car that will cover significant mileage without drama. The interior quality is functional rather than inspiring — plastics that feel adequate but won't impress passengers who've been in a VW Polo — and the technology is dated by current standards. Where it earns its keep is in long-term reliability and low ownership costs. Parts are inexpensive, servicing is straightforward, and Hyundai's five-year warranty coverage on second-gen cars sold new means many examples have been looked after properly through their early years. A well-maintained 2017–2020 second-gen in SE or Premium trim with below-average mileage is still a rational buy at the right price.
The third-generation i20 (2020 onwards) is the better car by a meaningful margin. Hyundai completely redesigned the i20 on a new platform — the interior quality improved significantly, the infotainment system went from adequate to genuinely good, the ride quality got better, and the 1.0 T-GDi engine in its most popular tune is noticeably more refined than what it replaced. If you're spending over £13,000 on a used i20, the third-gen is what you want. Below that, the second-gen makes more financial sense.
Which engine?
On the second-gen, the main choice is between the 1.2 naturally aspirated petrol (75PS or 84PS) and the 1.0 T-GDi turbo (100PS or 120PS):
The 1.2 is the simpler, more common engine — uncomplicated, cheap to service, utterly unstressful to own. It's not fast, and at motorway speeds it takes some commitment to maintain legal speeds up inclines, but for predominantly urban use it does the job without complaint. Economy runs to 45–50mpg in real-world use. Parts are cheap and every garage can work on it.
The 1.0 T-GDi turbo from the second-gen range has attracted more reliability discussion than the naturally aspirated engine. Some owners report hesitation and rough running from the direct injection system, particularly on cars that have been used predominantly on short trips where carbon buildup on the intake valves becomes a problem. Not a universal fault — many have covered 80,000 miles without issue — but worth being aware of on any second-gen example. Ask about running behaviour and check for any hesitation during the test drive warm-up.
On the third-gen, the revised 1.0 T-GDi (100PS or 120PS, with or without mild-hybrid assistance) is substantially better than its predecessor. The mild-hybrid (MHEV) system adds a small electric motor to assist the engine under acceleration and recover energy under braking — it doesn't provide meaningful electric-only range but it improves refinement and fuel economy in urban driving. The MHEV version is the one to look for: the fuel economy improvement is real (typically 48–54mpg in mixed use) and the mild-hybrid system has been reliable in service. Standard 1.0 T-GDi without MHEV is fine; the MHEV is a worthwhile upgrade if the price difference is small.
The 1.2 naturally aspirated petrol is also available in the third-gen for budget-conscious buyers who want the newer design without the slightly higher cost of the turbocharged engine. Competent but limited at motorway speeds in a way that the 1.0 T-GDi isn't.
Which trim?
The second-gen trim hierarchy runs from SE through SE Nav to Premium and Premium SE. On the used market, SE Nav offers the most complete everyday specification at the sharpest price — the built-in navigation means you're not dependent on a phone-mirror connection for routing, which matters on cars where the infotainment integration can be variable.
On the third-gen, the trim choices are SE Connect, Premium, and Ultimate:
SE Connect is the entry point but it's well specified — 10.25-inch touchscreen with wireless Apple CarPlay, rear parking camera, lane keeping assist, and automatic emergency braking as standard. The third-gen's standard specification in this trim is better than many competitors' mid-level trim.
Premium adds blind spot detection, heated front seats, and some visual upgrades. Worth the modest premium on the used market for buyers who spend time in urban traffic.
Ultimate is the top spec — panoramic sunroof, upgraded audio, and the full suite of driver assistance systems. A well-specified car that compresses in value on the used market; check whether the panoramic roof seal is in good condition on any older Ultimate example.
What goes wrong?
Carbon buildup on 1.0 T-GDi (second-gen). Direct injection engines — the fuel injector sprays directly into the cylinder rather than at the intake port — are more susceptible to carbon deposits on the intake valves, particularly on cars that have done most of their mileage on short cold trips. The symptom is hesitation on light throttle, rough running at low revs, and occasional misfires. The solution is an intake cleaning service — it can be done with walnut shell blasting or chemical treatment and typically costs £150–£250. Not common on every second-gen, but check the symptoms on any example over 60,000 miles.
Panoramic sunroof drainage on Ultimate trims. Any car with a panoramic glass roof has drainage channels around the perimeter that can become blocked with leaf debris and organic matter. On the i20 Ultimate, blocked drains can lead to water ingress into the headlining or rear footwells. Check the condition of the headlining for any staining and run your hand under the rear carpet to confirm it's dry.
Clutch wear on city-use manual cars. The i20's clutch is appropriately sized for the engine output but heavy urban use shortens its life. On any third-gen manual over 50,000 miles that's lived in a city, ask whether the clutch has been replaced and budget for it if not.
Minor electrical advisories on second-gen cars. The second-gen i20 attracted a pattern of minor electrical advisories — dashboard warning lights that cleared themselves, minor sensor faults — that were in most cases resolved by software updates at service visits. Not a significant reliability concern but worth knowing if the MOT history shows recurring electrical advisory items.
What you should actually pay
- Second-gen 1.2 SE (2016–2019): £6,500–£10,000
- Second-gen 1.0 T-GDi Premium (2017–2020): £9,000–£12,500
- Third-gen 1.0 T-GDi SE Connect (2020–2022): £13,000–£17,000
- Third-gen 1.0 T-GDi MHEV Premium (2021–2023): £15,000–£19,500
- Third-gen Ultimate (2021–2023): £17,000–£22,000
The i20 holds its value better than many superminis, partly because of the strong residual reputation and partly because the warranty coverage on new cars limited early depreciation. Expect used prices to reflect this — a clean third-gen i20 with full history won't be cheap.
Before you see it
Check the MOT history for any patterns in advisory items, and look specifically at whether oil changes have been maintained at the recommended interval — the 1.0 T-GDi benefits from fresh oil. On any second-gen car, check whether the five-year warranty would still be in effect (cars registered new from 2019 might still have some warranty remaining).
Check the MOT history before you go →
Free MOT checker at AllCarsUKRegistration plate only. Every test, advisory, and mileage. Free, instant, no account required.
On the test drive: start from cold and let the engine warm for a minute before pulling away — any hesitation from the 1.0 T-GDi during warm-up is worth investigating. Test the infotainment connectivity with your phone. On any car with the panoramic roof, check the headlining carefully. And drive at motorway speeds briefly to confirm the engine is comfortable at cruise — the naturally aspirated 1.2 has less reserves here than you might want if motorway driving is a significant part of your usage.
Should you buy one?
A 2021–2023 third-gen i20 in Premium or SE Connect trim, 1.0 T-GDi MHEV, full Hyundai service history: yes, without significant reservation. The third-gen i20 is the car that closes the gap between the class-standard Fiesta and VW Polo more than any previous i20 managed — the interior quality is where it needs to be, the infotainment is genuinely good, and the MHEV system delivers real-world economy without complexity. And the reliability record across Hyundai's small car range gives confidence that it will be low-drama to own. For buyers who want to be looked after without paying for a badge, the i20 makes more sense than it ever has.
The i20's five-year warranty transfers with the car to subsequent owners within the original warranty period, which means a 2022 i20 bought today may still carry manufacturer cover. Check the original registration date against the remaining warranty window before you view — it's a meaningful bonus that most buyers forget to ask about.
In N Line trim specifically, the stiffer suspension is noticeable on typical UK B-roads and the wider tyres cost more to replace. If you're buying an i20 for economy and everyday reliability rather than driving involvement, the SE Connect's standard suspension is the better long-term ownership choice. The reliability, the running costs, and the total ownership picture are the reasons to buy an i20. The N Line's ride is a daily price to pay for a visual upgrade that the other two-thirds of the car makes irrelevant.
Also see: Ford Fiesta Buying Guide | Vauxhall Corsa Buying Guide | Kia Rio Buying Guide