What goes wrong, what it costs, and what to check before you buy a used Hyundai Sonata.
The Hyundai Sonata occupies a niche position on the UK market.
We track 5 known issues across the Hyundai Sonata range, with 4 classified as significant. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Hyundai Sonata? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
EF (1998–2005) — Engine options included the 2.0 Petrol.
NF (2004–2010) — Petrol options included the 2.4 Petrol, with 2.0 CRDi on the diesel side. We track 5 known issues on this generation, with 4 classified as significant. The most significant concern is Subframe corrosion and mounting point deterioration (£800–£2,000 to address).
The rear subframe mounting points suffer from accelerated corrosion on fifth-generation Sonatas, particularly around the suspension component mounting areas. The corrosion typically starts from the inside out and can progress to structural failure without visible external warning signs.
Advanced subframe corrosion can lead to catastrophic failure of the rear suspension mounting points while driving, causing complete loss of vehicle control. Repair typically requires cutting out corroded sections and welding in new metal, often costing more than the vehicle's value. The car is not safe to drive if structural corrosion is advanced.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
The rear suspension components, particularly control arms and mounting brackets, suffer from accelerated corrosion on NF Sonatas. MOT data shows this model fails at 134.4x the fleet average for suspension component damage or corrosion, with the problem worsening over time. The corrosion typically affects the steel components rather than bushes, leading to structural weakness and potential component failure.
Corroded suspension components can fail suddenly, leading to loss of vehicle control and potential wheel separation. Replacement of multiple rear suspension components is typically required once corrosion becomes advanced. The extent of corrosion often makes repair costs uneconomical relative to vehicle value.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
The brake calipers on NF diesel Sonatas are prone to binding and seizure, with MOT data showing 134.4x the fleet average failure rate for binding brakes. The issue typically affects the rear calipers first, caused by corrosion of the caliper slides and seizure of the handbrake mechanism. The problem worsens over time and can lead to brake disc warping, excessive pad wear, and reduced braking performance.
Seized brake calipers cause uneven braking, increased stopping distances, and can lead to loss of vehicle control under heavy braking. Continued driving with binding brakes will warp the brake discs and require replacement of both calipers and discs. The vehicle remains driveable but with compromised safety.
Check brake disc condition for lipping or scoring. Test braking at moderate speed for pulling to one side or vibration through the steering wheel. Review MOT advisories for brake-related items.
The coil springs on NF Sonatas fail at 134.4x the fleet average rate, typically fracturing due to corrosion-induced metal fatigue. The problem affects both front and rear springs but is more common at the rear. Spring failure usually occurs gradually with the spring cracking rather than complete separation, but can cause sudden ride height loss and handling deterioration.
A fractured spring reduces vehicle stability and can cause uneven tyre wear, poor handling, and potential loss of control in emergency maneuvers. Complete spring failure can damage other suspension components and make the vehicle unsafe to drive. Springs typically fail in pairs due to similar wear patterns.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
The CV joint boots on NF Sonatas deteriorate at 20.8x the fleet average rate, typically affecting the outer joints first. The rubber boots crack and split, allowing the CV joint grease to escape and contamination to enter. This is primarily an age-related failure as the rubber compound degrades over time, but can be accelerated by road salt and temperature cycling.
Failed CV joint boots allow grease to escape and contamination to enter, leading to accelerated wear of the expensive CV joint itself. If caught early, only the boot needs replacement. If left until the joint wears, the entire driveshaft typically requires replacement. The car remains safe to drive temporarily but the joint will eventually fail.
Listen for clunking or vibration from underneath when pulling away or changing direction. Check for play in the driveshafts by rocking the car in gear with the handbrake on. Worn CV boots are a telltale sign — look for grease splatter around the inner wheel arch.
For the full breakdown of all 5 tracked issues with repair costs, see the Hyundai Sonata common problems page.
Based on 4k real DVSA MOT tests, the Hyundai Sonata fails more often than average on several items. The biggest outlier is light unit fault at 23x the fleet average, followed by transmission shaft constant velocity joint boot... (18x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Hyundai Sonata MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 10k miles) typically costs £80–£120 at an independent garage.
See the full Hyundai Sonata service schedule for every interval and cost breakdown.
The Hyundai Sonata is a solid choice on the used market, though not without its quirks. The issues we track are well-understood and largely avoidable if you know what to look for. A thorough inspection and complete service history go a long way.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Hyundai Sonata, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known Hyundai Sonata issues. We are not affiliated with any source listed.