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Hyundai2017–2023 Critical issues documented

Hyundai Kauai SX2: common faults & what to check

The SX2 is the Hyundai Kauai built 2023 onward. Of the 13 faults documented for the Kauai, 4 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

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13

Documented faults

Critical

Most serious

$700–$2,800

Typical repair

5

Systems covered

You're looking at the SX2

Everything below is narrowed to this variant. Pick a different one to change it.

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Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

A 2024 Hyundai Kauai is the SX2 generation (2023 to now).

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Hyundai Kauai SX2

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Can't confirm for this car

Hyundai Kauai · 2024

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

  • No engine is recorded for this vehicle.

matched on year only

What to look out for

We have not documented any faults for the exact Hyundai Kauai you picked.

That is a gap in our research, not a clean bill of health — it does not mean this combination is trouble-free, and it is not a reason to skip the checks. Every one of the 13 faults documented across the Hyundai Kauai is still listed further down this page.

Show every year and engine again

See all 4 issues for this oneDocumented for the exact year and engine you picked, including 1 rated critical.
Depends on the exact engine — 4 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.
Engine, transmission & cooling3

01G4KH 2.0T bearing failure from cold-start oil starvation

Verify documented oil change history with receipts showing intervals.petrol2021 onwardEngine
OccasionalEngine $9,000–$18,000 to fix

Can't confirm for this car

The Kona N shares the G4KH 2.0-litre turbocharged engine with the i30 N and carries the same documented risk of connecting rod and main bearing failure from oil starvation during cold starts. The mechanism involves inadequate oil film build-up at the crank and rod bearings during the initial engine rotation after extended cold soaks, leading to metal-to-metal contact and progressive or sudden bearing failure. This failure mode is tied to the broader Theta-family engine epidemic for which Hyundai issued extended warranty coverage in several markets. NZ/AU Kona N owners should verify via VIN whether their vehicle is covered under any extended powertrain warranty provision. Catastrophic bearing failure results in engine seizure requiring short-block or complete engine replacement at high cost.

Symptoms to notice

  • Metallic knocking or tapping noise on cold start that reduces once warm
  • Oil pressure warning light at idle or low RPM
  • Rough running followed by sudden power loss
  • Complete engine seizure

What to check

  1. Verify documented oil change history with receipts showing intervals.
  2. Cold-start the engine and listen for any lower-block knock.
  3. Check for oil pressure warning history via stored fault codes.
  4. Request Hyundai NZ/AU to check extended warranty eligibility by VIN against the Theta-family engine program.

Where to look: Engine block — crankshaft main bearings and connecting rod big-end bearings

Ask the seller

  • “Has the vehicle been checked under Hyundai's extended Theta-family powertrain warranty?”
  • “What oil change intervals were maintained and is there a documented service history?”
  • “Has the oil pressure warning light ever come on?”
  • “Is there any history of engine noise, inspection, or recall work?”

02D8F2 DCT clutch pack vibration on hill hold release

Find a moderate gradient and test repeated pull-aways from rest, specifically triggering the hill hold system each time.petrol2021 onwardTransmission
CommonTransmission $400–$7,500 to fix

Can't confirm for this car

The Kona N is equipped with the D8F2 8-speed wet dual-clutch transmission, a revised variant of the unit used in the i30 N. A specific documented fault involves vibration and shudder at the moment of hill hold release, when the automated clutch engages to prevent rollback on a gradient. The hill hold clutch engagement event occurs under precise clutch-pack load conditions that expose inconsistencies in clutch facing wear and hydraulic engagement pressure. The vibration transmits through the floorpan and drivetrain and can be accompanied by a brief engine stumble. TCU software updates provide partial mitigation but do not resolve mechanical clutch-pack wear at higher mileage. Severity increases with accumulated clutch engagement cycles common in urban stop-start and hilly driving conditions.

Symptoms to notice

  • Vibration or shudder when pulling away from a stop on an incline
  • Drivetrain shudder at the precise moment hill hold releases
  • Brief engine stumble accompanying clutch engagement on hills
  • Progressive worsening of vibration intensity with accumulated mileage

What to check

  1. Find a moderate gradient and test repeated pull-aways from rest, specifically triggering the hill hold system each time.
  2. Assess smoothness of clutch engagement at the release point.
  3. Check service history for any DCT software updates.
  4. Evaluate whether shudder is consistent or only in cold conditions, and assess whether it worsens with repeated attempts.

Where to look: Transmission unit — D8F2 wet dual-clutch pack and hydraulic engagement system

Parts involved: Clutch.

Ask the seller

  • “Has the DCT software been updated to the latest calibration at a Hyundai dealer?”
  • “Has any clutch pack wear or replacement been documented in the service history?”
  • “Is the hill hold vibration present every time or only when the transmission is cold?”
  • “Has the DCT transmission fluid been changed and what specification fluid was used?”

03G4KH GDI intake valve carbon buildup at high mileage

Scan for misfire fault codes.petrol2021 onwardEngine
OccasionalEngine $1,200–$2,800 to fix

Can't confirm for this car

The Kona N shares the G4KH 2.0-litre turbocharged direct injection engine with the i30 N and is subject to the same documented intake valve carbon accumulation fault. Without port fuel injection washing the intake valves, oil vapour from the positive crankcase ventilation system deposits hard carbon on intake valve stems, necks, and faces over time. By approximately 80,000km, airflow restriction becomes significant enough to cause rough idle, misfires, and measurable power loss. NZ/AU Kona N examples are currently younger and generally lower mileage but this fault will become prevalent as the fleet ages. Physical media blasting of intake valves is the only effective treatment and must be repeated at subsequent high-mileage service intervals throughout the vehicle life.

Symptoms to notice

  • Rough or lumpy idle when engine is at operating temperature
  • Cylinder misfire codes P0301 through P0304
  • Noticeable loss of power and throttle response
  • Higher than expected fuel consumption

What to check

  1. Scan for misfire fault codes.
  2. Check mileage — less of a concern under 60,000km but flag as a future mandatory maintenance item.
  3. Review service history for any prior valve cleaning service notation.
  4. If a workshop inspection is possible: Use a borescope through intake ports to inspect intake valve carbon deposit formation.

Where to look: Intake valves — all four cylinders within the cylinder head

Parts involved: PCV / oil separator.

Ask the seller

  • “Has the intake valve carbon been professionally cleaned at any point?”
  • “Are there any active or stored misfire fault codes?”
  • “Has the vehicle experienced hesitation or rough idle recently?”
  • “What is the complete engine service history?”
Body, brakes, suspension & interior1

01Brake booster vacuum pump seal failure causing spongy pedal

Perform vacuum depletion test with engine running — pump pedal repeatedly then hold; check for pedal movement under sustained load.petrol2021 onwardBrakes
OccasionalBrakes $900–$2,200 to fix

Can't confirm for this car

The Kona N uses the same electric vacuum pump arrangement as the i30 N to provide brake servo assistance, as the turbocharged G4KH engine does not produce sufficient manifold vacuum for a conventional brake booster. Documented seal failure in the electric vacuum pump causes progressive vacuum loss and degraded brake pedal feel. Early-stage failure presents as intermittent sponginess — particularly on the first brake application after engine start — while advanced seal failure results in a consistently elevated and firm pedal requiring excessive driver effort. The fault can be difficult to diagnose as it closely mimics low brake fluid or air in the hydraulic system. Complete replacement of the vacuum pump unit is the accepted dealer repair procedure.

Symptoms to notice

  • Spongy or elevated brake pedal requiring greater foot pressure than expected
  • Pedal feel that varies between applications — normal then unusually firm
  • Reduced braking confidence on the first stop after engine start
  • Audible hiss from vacuum system during or immediately after brake application

What to check

  1. Perform vacuum depletion test with engine running — pump pedal repeatedly then hold; check for pedal movement under sustained load.
  2. Inspect the electric vacuum pump body and hose connection seals for deterioration or cracking.
  3. Scan for any brake system vacuum fault codes.
  4. Confirm brake fluid level and condition are not contributing factors before attributing fault to the pump unit.

Where to look: Electric brake vacuum pump — engine bay, typically near firewall or engine mount

Ask the seller

  • “Has the brake pedal ever felt unusually high, hard, or spongy during normal driving?”
  • “Has the vacuum pump been inspected or replaced at any point?”
  • “Are there any stored fault codes relating to the brake system?”
  • “Has a brake fluid flush been performed recently and when?”
Other Hyundai Kauai engines and years9 documented issues that do not apply to the one you picked.
Engine, transmission & cooling5

01EPCU coolant ingress causing loss of drive power

Check Hyundai service records to confirm EPCU was inspected and replaced under recall 22V941 (Hyundai recall 239).ev2021Cooling
RareCooling $0 to fix

Does not apply

The Electric Power Control Unit (EPCU) on certain 2021 Kona Electric vehicles was improperly sealed during production due to inadequate steam cleaning at the factory. Coolant can leak internally onto the EPCU circuit board, causing an electrical short circuit. This may trigger a limited-mobility fail-safe drive mode or a sudden complete loss of motive power while driving, creating a crash risk. NHTSA recall 22V941 covered approximately 853 affected units produced between June and July 2020. Hyundai remedy is EPCU inspection and replacement at no cost.

Symptoms to notice

  • Sudden loss of drive power while in motion
  • Vehicle enters limp-home or fail-safe mode with reduced power
  • 'Check Electric Vehicle System' warning on dashboard
  • Coolant level dropping with no visible external leak

What to check

  1. Check Hyundai service records to confirm EPCU was inspected and replaced under recall 22V941 (Hyundai recall 239).
  2. Ask dealer to verify via VIN lookup whether recall is open or completed.
  3. Inspect coolant reservoir level and look for evidence of previous low-coolant warnings in service history.
  4. Check EPCU area for signs of prior moisture damage.

Where to look: Electric Power Control Unit (EPCU), engine bay

Ask the seller

  • “Has the EPCU been inspected and replaced under Hyundai recall 239 (NHTSA 22V941)?”
  • “Has the coolant system been checked for leaks since the EPCU recall?”

02G4FJ 1.6T Turbocharged Engine Excessive Oil Consumption

Check oil level on dipstick at purchase — note whether it is at maximum or mid-range.petrol2019–2021Engine
OccasionalEngine $800–$6,000 to fix

Does not apply

A documented subset of Kona 1.6T engines consume engine oil at above-normal rates — up to 1 litre per 3,000 km — attributed to piston ring seal degradation and valve stem seal wear accelerated by the turbocharged thermal environment and GDI combustion characteristics. Sustained low oil levels without visible external leaks risk turbocharger bearing failure and crankshaft bearing damage. NHTSA received complaints and Hyundai issued guidance recommending oil level monitoring between service intervals as an interim measure.

Symptoms to notice

  • Oil level drops measurably between service intervals with no visible external leak
  • Blue or grey smoke from exhaust on cold startup or under hard acceleration
  • Burning oil smell from engine bay during or after driving
  • Oil-fouled spark plugs found during routine service
  • Turbocharger noise or reduced boost response in advanced cases

What to check

Check oil level on dipstick at purchase — note whether it is at maximum or mid-range; inspect for blue-tinged exhaust smoke on cold startup and during hard acceleration; check spark plugs for oil fouling; ask owner how often oil is topped up between services; inspect around valve cover gasket for seepage.

Where to look: Engine internals — piston rings and valve stem seals; turbocharger oil feed and return lines

Parts involved: Turbocharger.

Ask the seller

  • “How often does oil need to be topped up between services, and how much is typically added?”
  • “Is there any record of a warranty claim or oil consumption test conducted at a Hyundai dealer?”
  • “Has the turbocharger been inspected, serviced, or replaced during ownership?”

037-speed dry dual-clutch (7DCT) shudder at low speed

Test drive extensively in stop-start traffic, reverse parking, and uphill starts.petrol2017–2021Transmission
CommonTransmission $1,800–$4,800 to fix

Does not apply

The Kona 1.6T pairs with Hyundai's 7-speed dry dual-clutch transmission. The 7DCT was widely reported to shudder, vibrate, and hesitate during low-speed manoeuvring, parking, and creeping in traffic. Hyundai issued software calibration updates and eventually extended warranty coverage in several markets. The dry clutch design is less tolerant of repeated low-speed slip compared to a wet clutch DCT, and prolonged city driving accelerates wear. Clutch fork and actuator issues also documented in higher-mileage examples.

Symptoms to notice

  • Shudder or vibration during slow-speed clutch engagement
  • Hesitation pulling away from traffic lights
  • Judder in car parks and low-speed reversing
  • Clunking or jerking when selecting drive

What to check

  1. Test drive extensively in stop-start traffic, reverse parking, and uphill starts.
  2. Check for TSB/software update completion at a Hyundai dealer.
  3. Enquire whether the transmission has been replaced or had clutch work done under warranty.

Where to look: 7-speed dual-clutch transmission, mid-vehicle

Parts involved: Clutch.

Ask the seller

  • “Has the 7DCT software calibration update been applied?”
  • “Any shudder or judder reported to the dealer?”
  • “Has the transmission been replaced or repaired?”

04G4FJ 1.6 T-GDI timing chain rattle and tensioner wear

Cold-start the vehicle and listen immediately at the front of the engine for chain rattle.petrol2017–2021Engine
OccasionalEngine $1,600–$3,800 to fix

Does not apply

The Kona G4FJ 1.6 T-GDI turbocharged direct injection engine shares the timing chain architecture with other Hyundai-Kia 1.6T engines documented to develop chain rattle due to tensioner wear and chain stretch. Rattle is most pronounced on cold start and at idle when oil pressure is lowest. Chain elongation can cause timing deviation leading to misfires, power loss, or in severe cases timing-related engine damage. Oil change compliance at or before the manufacturer interval is critical — extended intervals accelerate wear.

The front of a dual overhead camshaft engine with the timing cover removed, exposing the timing chain and sprockets.Example of the part — not this vehicle

The front of a twin-cam engine with the timing cover off — chain, sprockets and guides.

Logansenf · CC BY-SA 4.0 · Wikimedia Commons

Symptoms to notice

  • Metallic rattling from front of engine on cold start
  • Rattle persisting beyond engine warm-up
  • Timing-related misfire codes
  • Reduced power with possible cam/crank position sensor codes

What to check

Cold-start the vehicle and listen immediately at the front of the engine for chain rattle. Check full service history for oil change compliance. Ask a workshop to check timing chain stretch if history is incomplete. If a workshop inspection is possible: Pull OBD codes and look for P000A, P000B, or misfire codes.

Where to look: Front of engine, timing chain cover

Parts involved: Timing chain.

Ask the seller

  • “What oil change interval has been followed?”
  • “Any timing-related warning lights or fault codes?”
  • “Has the timing chain or tensioner been replaced?”

05G4FJ 1.6T GDI Intake Valve Carbon Accumulation

Watch for: Rough idle or vibration at startup, particularly on cold mornings.petrol2017–2023Engine
Very commonEngine $700–$1,600 to fix

Does not apply

As a port-less direct-injection engine, the G4FJ 1.6T does not direct fuel past the intake valves, so combustion blow-by oil vapour deposits accumulate on valve stems and seats without being washed away. By 80,000–120,000 km, carbon build-up can restrict airflow sufficiently to cause rough idle, cold-start hesitation, and misfires. The only effective remedy is manual cleaning via walnut shell media blasting through the intake ports, or manual scraping after intake manifold removal — an approximately 4–6 hour workshop procedure.

Symptoms to notice

  • Rough idle or vibration at startup, particularly on cold mornings
  • Hesitation or stumble during light throttle application at low rpm
  • Misfire fault codes (P0300–P0304) logged on OBD-II scanner
  • Gradual reduction in fuel economy not explained by other faults
  • Occasional hard or prolonged cold start

What to check

Watch for: Rough idle or vibration at startup, particularly on cold mornings. If a workshop inspection is possible: Borescope inspection of intake ports and valve faces through intake manifold openings; check for rough idle or hesitation that worsens when cold; pull OBD-II codes for misfires (P030x); review service history for any prior carbon cleaning or catch-can installation.

Where to look: Intake valves and intake port walls, accessible after intake manifold removal — rear of engine cylinder head

Parts involved: Intake manifold.

Ask the seller

  • “Has intake valve carbon cleaning been performed, and at what odometer reading?”
  • “Has the vehicle had recurring misfire codes or rough idle complaints?”
  • “Is there a record of an oil catch-can installation to slow reaccumulation?”
Electrical4

01Automatic Emergency Braking (AEB) Phantom Activation at Highway Speed

Check front radar sensor (lower grille) for stone chip damage, misalignment, or obstruction.2018–2023Electrical
OccasionalElectrical $300–$1,200 to fix

Does not apply

Kona owners across multiple engine variants have reported unintended AEB activations where the system applies full emergency braking without a genuine obstacle present, typically at highway speeds and in conditions including rain, low-angle sun, tunnel entries, and motorway overpasses. NHTSA opened Preliminary Evaluation PE21-020 into the broader Hyundai/Kia AEB false activation pattern. A phantom braking event at highway speed creates an immediate rear-end collision risk from following traffic and represents a serious safety concern for highway driving.

Symptoms to notice

  • Sudden, unannounced full emergency braking at highway speed without visible obstacle
  • Forward collision warning alert triggering on clear road
  • AEB intervention warning light illuminating without cause
  • Events more frequent in rain, at tunnel entrances, or under motorway overpasses
  • Near-miss rear-end collision incidents from vehicles following behind

What to check

Check front radar sensor (lower grille) for stone chip damage, misalignment, or obstruction; verify front camera (top of windscreen) calibration status — especially if windscreen has ever been replaced; ask about any prior AEB-related software updates applied at dealer; test drive on a motorway to observe system behaviour.

Where to look: Front radar sensor (lower grille centre), forward-facing camera (upper windscreen behind mirror)

Ask the seller

  • “Has the car ever braked suddenly at highway speed without an obstacle being present?”
  • “Has the front windscreen ever been replaced, and if so was the forward camera recalibrated at a Hyundai dealer?”
  • “Have any AEB or ADAS-related software updates been applied at a Hyundai dealer since purchase?”

02High-voltage battery internal short circuit, fire recall (Kona Electric)

Verify recall completion via the NZ NZTA recall checker or AU FCAI recall portal using the VIN before purchase.ev2018–2023Electrical
RareElectrical $0 to fix

Does not apply

Hyundai recalled the OS Kona Electric because the high-voltage battery could short circuit internally and catch fire, especially when charging or parked. 2018 to 2020 cars were covered by recall 01D076 (battery check and software) and recall 11D043 (REC-001592, battery pack replacement). A further recall, 61D004 (REC-006586, April 2026), updates the battery management software on 2018 to 2023 cars. Until the work is done, park and charge outside and away from buildings, and ask a Hyundai dealer to check the VIN for both recalls.

Symptoms to notice

  • Battery warning light
  • Unexpected reduction in charging acceptance
  • Vehicle or charging area showing signs of heat stress (rare but documented)

What to check

  1. Verify recall completion via the NZ NZTA recall checker or AU FCAI recall portal using the VIN before purchase.
  2. Confirm with a Hyundai dealer that the replacement HV battery pack has been fitted.
  3. Do not purchase without confirmed recall rectification.

Where to look: High-voltage battery pack beneath the vehicle floor

Ask the seller

  • “Has the Hyundai battery fire recall been completed on this vehicle?”
  • “Can you provide the Hyundai dealer confirmation of battery replacement?”
  • “Was the vehicle ever subject to the 80% charge limit advisory?”

03High-Voltage Battery Capacity Degradation Below Warranty Threshold

Request a BMS state of health (SOH) reading via OBD-II adapter and a compatible EV diagnostic app (Car Scanner with Hyundai EV PIDs).ev2019–2023Electrical
OccasionalElectrical $0–$22,000 to fix

Does not apply

The Kona Electric 64kWh battery pack shows above-average capacity loss in vehicles that have experienced high ambient temperatures, frequent DC fast charging, or that received only the BMS software update rather than full pack replacement under the fire recall. Hyundai's warranty covers degradation below 70% state of health (SOH) within 8 years or 160,000 km, but vehicles can lose 10–15% capacity before reaching the warranty intervention threshold, meaningfully reducing real-world range from the rated 449 km WLTP. Battery pack replacement outside warranty coverage is one of the most expensive repairs on any used EV.

Symptoms to notice

  • Full-charge range estimate consistently below 350 km on a moderate day
  • Battery capacity readout below 58 kWh net usable on diagnostic scan
  • State of health reading below 85% on OBD diagnostic tool
  • Charge percentage drops faster than expected during normal driving
  • DC fast charging speed reduces earlier than expected below 80% SOC

What to check

Request a BMS state of health (SOH) reading via OBD-II adapter and a compatible EV diagnostic app (Car Scanner with Hyundai EV PIDs); compare the actual usable capacity reading against the rated 58 kWh net usable; check DC fast charge history count if accessible via dealer diagnostics.

Where to look: Underfloor 64kWh lithium-ion high-voltage battery pack, full length of cabin floor

Ask the seller

  • “What does the battery state of health (SOH) percentage currently read on a diagnostic scan?”
  • “How frequently has the vehicle used DC fast charging, and has it operated in hot climates?”
  • “Was the vehicle's battery replaced under the fire recall, or was only the software update applied?”

0412V Auxiliary Battery Premature Failure — Vehicle Fails to Power On

Watch for: Vehicle will not power on despite high-voltage battery showing charge.ev2019–2023Electrical
CommonElectrical $250–$650 to fix

Does not apply

The Kona Electric's 12V lead-acid auxiliary battery is charged by a DC-DC converter from the high-voltage pack rather than a conventional alternator, resulting in an atypical charge profile that causes premature cell failure — commonly within 2–4 years rather than the expected 4–6 years. Failure of the 12V battery prevents the vehicle control system from powering on and the high-voltage contactor from closing, leaving the car completely inoperative despite a fully charged HV pack. This is a common stranding fault and caught many early owners off guard.

Symptoms to notice

  • Vehicle will not power on despite high-voltage battery showing charge
  • Relay clicking sounds when pressing start but no system activation
  • Random electrical warnings or screen flickering before complete failure
  • Vehicle requires jump-start from 12V terminals to power on
  • Low 12V battery warning displayed on instrument cluster

What to check

Watch for: Vehicle will not power on despite high-voltage battery showing charge. If a workshop inspection is possible: Measure 12V battery resting voltage (must be 12.4–12.8V); check the date stamp on the battery case; scan DC-DC converter output voltage via OBD; inspect frunk or engine bay battery terminals for corrosion.

Where to look: 12V auxiliary battery located in front luggage compartment (frunk) on earlier models or engine bay on later variants

Parts involved: 12V battery.

Ask the seller

  • “When was the 12V auxiliary battery last replaced, and can you show a receipt?”
  • “Has the car ever failed to power on or required a jump-start?”
  • “Has the DC-DC converter been tested for correct output voltage at a Hyundai dealer?”

What these repairs cost on other cars

Some of the Hyundai Kauai’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Other Hyundai models

Hyundai Tucson42 documented faultsHyundai ix3541 documented faultsHyundai Elantra30 documented faultsHyundai Sonata13 documented faultsHyundai Ioniq 512 documented faultsHyundai Tucson ix3512 documented faults

Hyundai Kauai buyer questions

Is the Hyundai Kauai reliable?

Like any used car, it depends on the specific example and its service history. Across the 13 documented faults for the Hyundai Kauai, the recurring problem areas are engine, electrical, and cooling. A Hyundai Kauai with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used Hyundai Kauai?

We've catalogued 13 known faults for the Hyundai Kauai, covering engine, electrical, and cooling. All 13 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Hyundai Kauai?

Most single repairs on the Hyundai Kauai fall between $700–$2,800 at NZ independent-workshop rates. Some of the 13 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a Hyundai Kauai?

Yes. A Hyundai Kauai inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.