Are Hyundai and Kia Reliable in 2026? Hyundai vs Kia Reliability Breakdown

Yes, for most models built from 2020 on. Newer Hyundai and Kia vehicles rate average to above average for reliability, just behind Toyota and Honda, but many 2011 to 2019 models with Theta II four-cylinder engines carry a real risk of engine failure. Hyundai and Kia share engines, so their reliability is almost identical: the model year and engine matter far more than the badge.

Below you will find which years and engines to avoid, which models are safe bets, what repairs cost, and how the 10-year/100,000-mile powertrain warranty really works when you buy used.

Hyundai vs Kia Reliability: The Short Answer

Hyundai and Kia are sister brands that use the same engines, so their strengths and weak spots line up closely. Here is how they compare side by side.

The takeaway: if you are choosing between a Hyundai and a Kia, compare the specific model, year and engine, plus the dealer near you that will handle warranty work. The brand name alone tells you very little.

How Hyundai and Kia Reliability Changed

Twenty years ago, Hyundai and Kia were the budget options: the cars people bought when they couldn't afford anything else. The quality was... let's say "aspirational." Rust issues, electrical gremlins, and general unreliability were common talking points. But these companies had ambition and, more importantly, the capital to back it up.

Over the 2000s and 2010s, Hyundai and Kia invested heavily in design, engineering, and manufacturing quality. They hired talented designers (look at all those sleek new Kias: Sang Yup Lee and his team deserve credit), upgraded their factories, and gradually started building cars that didn't feel like compromises. Their warranty programs became industry-leading. They started winning awards. Industry analysts started taking them seriously.

By the early 2020s, Hyundai and Kia had genuinely earned reputations for making solid, well-designed vehicles at reasonable prices. They were no longer the punchline: they were legitimate competitors to Toyota, Honda, and the traditional players.

The Theta II Engine Problem: What Went Wrong

If you've heard anything negative about Hyundai or Kia recently, this is probably why.

The Theta II engine is a 2.0-liter turbocharged four-cylinder engine used in thousands of Hyundai and Kia vehicles built between 2011 and 2019. Around 2015, owners started reporting a concerning problem: sudden engine stalls, failure to start, and in the worst cases, complete engine failure and catastrophic engine damage. Basically, the engine would just... stop working. Sometimes while you were driving.

Hyundai and Kia initially investigated and found metal debris in the engines. They issued recalls and offered engine replacements, but the problems persisted. It turned out the issue wasn't just debris: it was a fundamental engineering problem related to the engine design. Owners reported their “new” replacement engines failing shortly after installation.

By 2021, the National Highway Traffic Safety Administration (NHTSA) had launched a full investigation. The evidence was staggering: hundreds of thousands of vehicles affected, thousands of engine failures, accident reports, and injury complaints. For context, we're talking about vehicles including the Hyundai Elantra, Hyundai Tucson, Kia Forte, and Kia Sportage, popular models with millions of owners.

Failures usually showed up between 50,000 and 100,000 miles, with stalling, engines that would not start and, in the worst cases, engine failure while driving. For model-by-model years and recall details, see our Hyundai Tucson and Santa Fe problems by year and Kia Sorento and Sportage problems by year guides.

Theta II Recall and Class Action Status in 2026

As of 2026, the Theta II situation remains messy.

Hyundai and Kia have expanded their recalls multiple times. They've offered extended warranties specifically for Theta II engines. Some owners have received full engine replacements, though many report ongoing issues with replacement engines and difficulties getting Hyundai and Kia dealerships to perform warranty work. Multiple class action lawsuits have been filed, and settlements have been reached in some cases.

However, here's what's critical: not every single Theta II engine has failed, but the failure rate is significantly higher than it should be. Owners have reported that their dealerships sometimes refuse to perform warranty work, leaving them responsible for thousands in repair costs. There are also widespread complaints about Hyundai and Kia using refurbished or substandard replacement engines rather than new ones.

If you're considering a used Hyundai Tucson or Santa Fe, or a Kia Sorento or Sportage from 2011 to 2019 with a Theta II engine, you need to know about this. Get a pre-purchase inspection from an independent mechanic. Check the recall status. Look for documentation of any engine work. This is non-negotiable.

How to check a specific car: run the VIN through the NHTSA recall lookup, ask a Hyundai or Kia dealer whether any engine campaign or software update is open, and ask the seller for oil change records. Missing records on a Theta II car are a reason to walk away or to price in an engine repair.

Hyundai and Kia Reliability Ratings: What the Data Shows

According to J.D. Power's latest dependability study, Hyundai is better than average for the industry, but not approaching Toyota's legendary reliability. Both brands have improved significantly over the past five years.

Consumer Reports ratings show a similar pattern. Hyundai and Kia models generally receive average to above-average reliability scores, with some standouts (like certain Sportage models) earning higher marks. However, specific model years with Theta II engines receive reliability ratings that are notably worse.

Long-term reliability data from CarComplaints.com and owner forums reveals a clear trend: Hyundai and Kia vehicles from 2010 to 2015 are more problematic than those from 2016 onwards (though Theta II issues extend to 2019 for some models). After about 2019 to 2020, both brands show marked improvements.

The warranty offers are telling, too. Hyundai offers a 10-year/100,000-mile powertrain warranty, the best in the industry. Kia offers 10-year/100,000-mile as well. For comparison, Toyota offers 5-year/60,000-miles. When a company is confident in their reliability, they back it up with warranty length. That said, we've heard too many stories of owners battling dealerships over warranty claims for Theta II issues.

For a detailed Kia Sportage problems breakdown, see our year-by-year analysis.

Is Hyundai or Kia More Reliable?

Neither brand is clearly more reliable. Hyundai and Kia share engines and much of their engineering, both rate "very good" in our cheapest cars to maintain ranking, and their average yearly maintenance costs are only about $10 apart (about $610 for Hyundai and $620 for Kia).

The real differences sit at the model level. A 2023 Tucson and a 2017 Tucson are very different risks, and the same is true of a 2020 Sorento and a 2017 Sorento. Pick the model and year first, then the brand.

Best and Worst Hyundai and Kia Years by Model

Most of the risk sits in a few models and years. Use this table as a starting point, then check the exact car's recall status and service history.

The rule of thumb: 2019 and earlier + Theta II engine = approach with caution and get a pre-purchase inspection.

Hybrid and electric models such as the Ioniq, Niro and EV6 rate well, partly because electric drivetrains are simpler.

Hyundai and Kia vs Toyota and Honda: Which Is More Reliable?

This is the comparison that matters most for practical buyers.

Toyota and Honda still have a reliability advantage, primarily because they've maintained consistent engineering quality across more model years and don't have a Theta II-style scandal in their recent history. Toyota Camrys and Honda Accords from 2010 are still running reliably for many owners. The same can't be said as broadly for Hyundai and Kia products from that era.

That said, modern Hyundai and Kia vehicles (2020+) are legitimate competitors to Toyota and Honda in terms of reliability, and often at a lower price point. A 2025 Kia Sportage EV might actually be more reliable long-term than a 2025 Toyota RAV4 (and definitely cheaper), simply because electric drivetrains are inherently simpler.

For used cars, though? Toyota and Honda still have the edge in predictability. You can buy a 2015 Toyota Camry with fairly high confidence. A 2015 Hyundai Sonata comes with more caveats.

Running costs follow the same pattern. Average yearly maintenance comes to about $520 for Toyota, $550 for Honda, $610 for Hyundai and $620 for Kia, so the gap is real but small. See the full Toyota vs Honda reliability comparison for how the two leaders stack up against each other.

The warranty advantage clearly goes to Hyundai and Kia. Their 10-year/100,000-mile powertrain coverage is a real benefit for owners planning to keep their cars long-term.

Ownership Costs: Repairs, Maintenance and Risk

Here's what matters if you're planning to keep a Hyundai or Kia for 10+ years:

What Hyundai and Kia Do Well

• Exceptional warranty coverage gives you peace of mind for the critical first decade
• Parts are increasingly affordable and readily available
• Their dealer networks have expanded significantly
• Fuel economy is generally excellent across their lineups
• Styling has improved: these cars don't look cheap anymore

Common Weak Spots

• The Theta II legacy means there's a trust deficit that newer models have to overcome
• Some reported issues with transmission quality on certain models and years
• Electrical gremlins crop up more frequently than with Toyota/Honda
• Dealer service quality varies wildly: some dealerships are excellent, others are notorious for warranty claim denial

The repair that matters most is the engine. A typical engine replacement costs $3,000 to $7,000 or more, and $5,500 to $8,000 or more on an SUV or pickup. Our model guides put a Theta II engine replacement on a Kia SUV at $4,500 to $8,000, and on a Tucson or Santa Fe as high as $10,000. Our engine replacement cost guide breaks down new, remanufactured and used engines.

Engine trouble is not unique to these brands. The Chevy Equinox and GMC Terrain had their own timing chain and oil consumption problems, which is why the model year matters more than the badge on any used car.

Protect your Hyundai or Kia engine after the factory warranty ends. A CoverageX Essential plan covers the engine, transmission and drivetrain, including seals, gaskets and turbocharger parts, and pays the repair shop directly, with 24/7 roadside assistance included. Coverage starts 30 days and 1,000 miles after purchase and does not cover problems that already exist, so the best time to protect a car is while it still runs well. Get a quote for your Hyundai or Kia with your year, make, model and mileage, or call 1-800-258-3413.

Hyundai and Kia Warranty: What It Covers and Who Gets It

Let's be real: Hyundai and Kia's industry-leading warranty is one of their strongest selling points. That 10-year/100,000-mile coverage on the powertrain means your engine, transmission, and drivetrain are protected for most people's ownership period.

If you buy used, read this first: the 10-year/100,000-mile powertrain warranty is for the original owner. When the car changes hands, the powertrain coverage drops to 5 years or 60,000 miles. Most used Hyundai and Kia models from 2019 or earlier are already past that point. See our powertrain warranty guide for what this coverage includes.

But there's a critical caveat: The warranty is only as good as your dealership's willingness to honor it. We've seen too many Theta II owners denied warranty claims despite recalls and extended coverage. Before buying, research your local Hyundai or Kia dealership's reputation on warranty service.

For the extended powertrain protection, Hyundai and Kia's official coverage is better than most aftermarket extended warranties. The trade-off is that you're dependent on the dealership network.

Is an Extended Warranty Worth It for a Hyundai or Kia?

It depends on where the car sits in its warranty life.

• New or still under factory coverage: usually not worth it yet. The factory powertrain warranty already covers the engine and transmission.
• Used and past the factory coverage, especially a 2011 to 2019 model: this is where a plan makes the most sense, because one engine or transmission failure can cost more than years of payments.
• Already showing engine symptoms: an extended warranty will not help. Pre-existing problems are not covered, so get the car inspected and repaired, or walk away.

If you are unsure, compare the plan cost with the repair costs above and with our list of times to skip an extended warranty.

Should You Buy a Hyundai or Kia New or Used?

Buying New or 2020 and Newer

Yes, with confidence. Modern products from both brands are reliable, well-designed, and backed by excellent warranties. You're also supporting companies that have genuinely learned from their mistakes.

Buying Used From 2015 to 2019

Only if you get a thorough pre-purchase inspection from an independent mechanic, confirm the recall status, and preferably see documentation of engine work if applicable. Budget for potential major repairs if you're buying in the 2015 to 2018 range.

Consider extended warranty protection options for additional peace of mind.

A pre-purchase inspection costs about $100 to $200 and is the cheapest protection you can buy on one of these cars. Use our used car inspection checklist when you go to see the car.

Buying Used From 2010 to 2014

You're probably better off shopping elsewhere unless it's a screaming deal and you're willing to risk it.

To compare the most reliable SUV options across all brands, check our comprehensive rankings.

The reality is that Hyundai and Kia have turned a corner. The Theta II scandal was massive and exposed real quality control issues, but both companies have invested heavily in fixing the underlying problems. Their recent vehicles are genuinely good, and their warranties provide real protection.

The trick is knowing which years and models to avoid. If you're shopping, use this guide as your reference. Check recalls before you buy. Don't skip the pre-purchase inspection on anything older than 2019. And when you're ready to make your decision, think about your own tolerance for risk: some people are fine rolling the dice, while others prefer the proven Toyota and Honda track records.

Want to go deeper? Our Kia Sorento and Sportage and Hyundai Tucson and Santa Fe guides cover each model year, our engine replacement cost guide gives realistic repair numbers, and our extended warranty buying guide shows how to compare protection plans.

Bought a used Hyundai or Kia, or about to? Check what plan coverage would cost for your exact car before something breaks. It takes your year, make, model and mileage, and monthly plans can be cancelled anytime. Get your free quote or call 1-800-258-3413, and see our guide to extended car warranty cost to know what a fair price looks like.

Hyundai and Kia Reliability FAQ

Is Hyundai or Kia more reliable?

They are about equal. Hyundai and Kia share engines, both rate "very good" for reliability, and average yearly maintenance is about $610 for Hyundai and $620 for Kia. The model, year and engine matter much more than the brand.

Are Hyundai and Kia as reliable as Toyota and Honda?

Close, but not quite. Newer Hyundai and Kia models (2020 and later) rate average to above average, just behind Toyota and Honda. For older used cars, Toyota and Honda are more predictable because they have no engine problem on the scale of the Theta II. Compare the leaders in our Toyota vs Honda reliability guide.

Which Hyundai and Kia engines have the most problems?

The Theta II four-cylinder has the worst record. Metal debris left from manufacturing could wear the bearings and lead to stalling or complete engine failure, often between 50,000 and 100,000 miles. It was used in many 2011 to 2019 models, including the Tucson, Santa Fe, Sorento and Sportage.

What Hyundai and Kia years should I avoid?

Be most careful with the 2016 to 2019 Tucson and Santa Fe with the 2.0L turbo, the 2016 to 2018 Kia Sorento and the 2011 to 2018 Kia Sportage. Older Elantra and Forte models (2011 to 2019) also need a recall check by VIN. Safer picks are 2020 and newer models. See the table in this article and our Kia Sorento and Sportage guide for details.

Are Hyundai and Kia cheaper to repair than Toyota or Honda?

Not quite. Routine maintenance runs about $610 a year for Hyundai and $620 for Kia, compared with about $520 for Toyota and $550 for Honda. Parts are affordable and easy to find, but a Theta II engine failure outside the warranty can cost $4,500 to $10,000. See our cheapest cars to maintain ranking.

Does the Hyundai and Kia 10-year warranty transfer to a second owner?

Only partly. The 10-year/100,000-mile powertrain warranty is for the original owner. A second owner gets powertrain coverage for only 5 years or 60,000 miles, so most used models from 2019 or earlier no longer have it.

Should I buy a used Hyundai or Kia with over 100,000 miles?

Only after an inspection. At that mileage the factory powertrain warranty has ended for every owner, so any engine or transmission repair is on you. Ask for oil change records, check open recalls by VIN, and read our guide to buying a used car with 100,000 miles.

Is it worth buying an extended warranty for a Hyundai or Kia?

It can be once the factory coverage ends. A new Hyundai or Kia is already covered by the 10-year/100,000-mile powertrain warranty, so most owners do not need one yet. A used model past its factory coverage, especially from 2011 to 2019, is where a plan pays off most, because one engine repair can cost several thousand dollars. CoverageX does not sell vehicle coverage in California.

Will an extended warranty cover a Theta II engine failure?

Yes, if the engine fails after your coverage starts. A CoverageX Essential plan covers the engine, transmission and drivetrain, and pays the repair shop directly. Problems that exist before you buy are not covered, and coverage starts 30 days and 1,000 miles after purchase, so buy the plan while the engine is healthy. See how it works.