EngineCritical
Theta II 2.0T/2.4 GDI rod-bearing failure / seizure.
- Typically appears
- 70,000+ miles
- What to inspect
- Listen for engine knock and confirm any engine replacement or recall/warranty work.
2018 Hyundai Santa Fe problems
A 2018 Hyundai Santa Fe is now 8 years old, so an average example has covered around 108,000 miles. The final model year of the generation · generally the most sorted build, so mileage, servicing and condition matter more than build-year faults. Check the state safety inspection and service history alongside the documented faults below, which are sorted by whether a 2018 car has usually reached the mileage where they appear.
Compiled & reviewed by the VehicleFaults Research Team
Quick answer
The 2018 Hyundai Santa Fe is 8 years old, so an average example has covered roughly 108,000 miles. At that mileage 7 of the documented faults are already due, so check those first.
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Build the inspection planFaults a 2018 example has usually reached
Documented onset mileage is at or below the ~108k miles an average 2018 car has covered.
EngineHigh
Oil consumption on GDI engines.
- Typically appears
- 70,000+ miles
- What to inspect
- Check oil level and consumption history.
BrakesMedium
Brake wear and ABS faults.
- Typically appears
- 60,000+ miles
- What to inspect
- Test braking and scan for ABS codes.
DrivetrainHigh
Loss of four-wheel drive and clunking from the front differential due to stripped transfer box splines.
- Typically appears
- 70,000-100,000 miles
- What to inspect
- Check for a flashing 4WD light. On a test drive, accelerate sharply on a loose or wet surface to see if the front wheels spin excessively without rear axle engagement.
Engine (Diesel)Medium
Rough idle, hesitation, and illuminated EML caused by a carbon-clogged EGR valve or cooler.
- Typically appears
- 50,000-80,000 miles
- What to inspect
- Start the engine from cold and let it idle. Listen for hunting or uneven revs. Rev to 2,500rpm and check for hesitation or excessive smoke from the exhaust.
SteeringLow
Clicking or clunking noise from the steering column due to a degraded rubber flexible coupling in the EPS motor.
- Typically appears
- 40,000-70,000 miles
- What to inspect
- With the engine running and the vehicle stationary, rock the steering wheel rapidly left and right by a few inches. Listen for a distinct metallic clunk from the column.
SuspensionMedium
Knocking noises from the rear and wandering at motorway speeds caused by worn rear trailing arm bushes.
- Typically appears
- 60,000-90,000 miles
- What to inspect
- Shine a torch into the rear wheel arches to inspect the inner tread of the rear tyres for severe stepping or wear. Push down firmly on the rear corners listening for creaks.
Faults that appear at any mileage
Age, electronics and build-related issues that are not mileage-driven.
BodyLow
Panoramic roof rattles / leaks.
- Typically appears
- Age-related
- What to inspect
- Test the roof and check for stains.
Inspecting a 2018 Hyundai Santa Fe?
Turn this car's known weak points into a step-by-step viewing plan · what to inspect, what a bad result means and what to ask the seller.
Build my inspection planHyundai Santa Fe · frequently asked questions
Is the Santa Fe reliable?
Value-oriented, but the Theta II engine failure risk is significant — check history.
What is the Theta II engine problem?
GDI rod bearings can fail and seize the engine; many were replaced under warranty.
Is there an engine warranty?
Extended powertrain warranties applied to many affected engines; confirm coverage.
Does the 2.2 CRDi diesel engine use a timing belt or a timing chain?
The 2.2-litre CRDi diesel engine fitted to UK Santa Fe models utilises a steel timing chain rather than a rubber timing belt. Under normal conditions, this chain is designed to last the lifetime of the engine and does not require routine replacement, provided the vehicle receives regular oil changes.
Are there common issues with the Diesel Particulate Filter (DPF) blocking?
Yes, like most modern diesels, the 2.2 CRDi is prone to DPF blockages if the vehicle is used primarily for short, urban journeys where the exhaust cannot reach regeneration temperatures. Dealers should check the dipstick; a rising oil level indicates failed regeneration attempts causing diesel to dilute the engine oil.
Does the automatic gearbox require routine fluid changes?
Hyundai originally marketed the six-speed automatic transmission as sealed for life. However, UK master technicians strongly advise replacing the transmission fluid every 60,000 miles to prevent valve body wear and harsh shifting. If a forecourt vehicle exhibits jerky gear engagements from cold, degraded fluid is usually the primary culprit.
Other Santa Fe model years
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