Is the 2018 HYUNDAI IONIQ reliable?

Excellent reliability. Very few MOT failures. 90% of HYUNDAI IONIQs from 2018 passed their MOT first time in 2026, based on 13,632 tests. That's 8 points above the national average of 82%.

How much does a 2018 HYUNDAI IONIQ cost to run?

Estimated annual running cost is £1,587 (£132/month), including £1137 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2018 HYUNDAI IONIQ?

The 2018 HYUNDAI IONIQ has a 90% MOT pass rate based on 13,632 tests in 2026. This ranks 332 out of 649 cars from 2018.

Which year HYUNDAI IONIQ is most reliable?

The 2022 HYUNDAI IONIQ has the highest MOT pass rate at 96%. The least reliable year is 2016 at 87%.

HYUNDAI IONIQ (2018)

Q: What is the average mileage for a 2018 HYUNDAI IONIQ?

The average mileage for a 2018 HYUNDAI IONIQ is 76,532 miles, which is above the expected 59,200 miles for a 8-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.

Running costs, reliability data, and common problems from 13,632 real MOT tests.

Annual Cost

£1,587

£132/month

MOT Pass Rate

90%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 12-25

1580cc Hybrid

Great Choice

90% pass rate, £1587/year to run. 8 points above average.

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Hybrid1580cc8 years old13,632 tests77k miles avg

Annual Running Costs

Fuel (Hybrid, 1580cc)

~42 mpg

£1,137

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,587

Per month£132/mo

Per week£31/wk

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT data. Insurance not included.

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Reliability Verdict

90% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 8 points above the national average of 82%. It also outperforms the HYUNDAI brand average of 83%.

At 8 years old, 90% of HYUNDAI IONIQs from 2018 passed their MOT first time in 2026. That's based on 13,632 tests across the UK. The average mileage at this age is 76,532 miles.

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How Does It Compare?

Rank among 2018 cars332th of 649(top 51%)

Rank among HYUNDAI models154th of 417(top 37%)

vs national average+8%(82% avg)

vs 2018 cars average+1%(89% avg)

vs HYUNDAI average+7%(83% avg)

Mileage Analysis

76,532

Average miles

59,200

Expected for age

The average 2018 HYUNDAI IONIQ has 76,532 miles on the clock, which is above the expected 59,200 miles for a 8-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.

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Best Year to Buy?

The most reliable year is the 2022 model with a 96% MOT pass rate, while the 2016 model has the lowest at 87%. The 2018 sits between the two at 90%.

HYUNDAI IONIQ by Year

Year	Pass Rate	Tests	Avg Mileage
2022	96%	1,142	33,523 mi
2021	91%	22,239	35,101 mi
2020	93%	14,346	41,368 mi
2019	92%	13,990	59,407 mi
2018	90%	13,632	76,532 mi
2017	89%	8,993	84,563 mi
2016	87%	739	83,741 mi

Similar Cars to Consider

MERCEDES C

2017 · 1991cc Hybrid

£1,922/year

89%

-1%

TOYOTA YARIS

2018 · 1349cc Hybrid

£1,582/year

91%

+1%

MINI COOPER S

2019 · 1499cc Hybrid

£1,582/year

92%

+2%

LAND ROVER RANGE ROVER SPORT

2019 · 1997cc Hybrid

£1,772/year

94%

+4%

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About the 2018 HYUNDAI IONIQ

The 2018 HYUNDAI IONIQ is a small family car with a 1580cc hybrid engine. 13,632 of these vehicles were MOT tested in 2026, making it one of the most commonly tested cars on UK roads. Among all cars from 2018, the average MOT pass rate is 89%, and this model beats that benchmark.

With an average of 76,532 miles at 8 years old, HYUNDAI IONIQ owners cover more miles than the average driver.

2018 HYUNDAI IONIQ Fuel Costs

The 1580cc hybrid engine offers a reasonable balance between performance and economy. Expect around 42 mpg in mixed driving, which works out to roughly £1,137 per year at current hybrid prices of 142p per litre (based on 7,400 miles per year). As a hybrid, real-world fuel costs will vary significantly depending on how much electric-only driving you do.

What does it cost to own a 2018 HYUNDAI IONIQ?

Total estimated annual running cost is £1,587 (£132/month), broken down as £1137 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 90% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

HYUNDAI IONIQ Reliability Trend

Newer HYUNDAI IONIQs show better MOT pass rates than older ones, with an average improvement of 4 percentage points.

Buying a Used 2018 HYUNDAI IONIQ

At 8 years old, this is a solid used buy if you find one with good service history. Depreciation has levelled off, so you won't lose much more value. Focus on condition over mileage. If you're flexible on year, the 2022 model has the highest pass rate at 96%. With 13,632 MOT tests in our data, there's strong statistical confidence in these figures.

Common Issues to Watch For

Based on the 2018 HYUNDAI IONIQ's fuel type, age, and engine size, these are the most likely problem areas to check.

Hybrid Battery Health

Watch out

After 8 years, hybrid battery capacity may have reduced. A full replacement costs £2,000-£4,000, though reconditioning is cheaper at £500-£1,500.

Inverter and Power Electronics

Medium risk

The inverter converts DC to AC for the electric motor. Failures are expensive (£1,500+) but relatively rare. Listen for unusual buzzing sounds.

Regenerative Braking

Medium risk

Brake discs can corrode from reduced use (the electric motor handles most braking). Surface rust is normal but deep pitting needs attention.

Suspension Wear

Medium risk

Shock absorbers, springs, and anti-roll bar links typically need attention around this age. Listen for clunks over bumps and check for uneven tyre wear.

Service History

Low risk

Always request a full service history. Regular servicing is the single best indicator of how well a car has been maintained, regardless of mileage.

Running Costs Compared

How the 2018 HYUNDAI IONIQ stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
HYUNDAI IONIQ(2018)	90%	£1137	£195	Grp 12-25	£1587
MERCEDES C(2017)	89%	£1327	£190	Grp 18-32	£1922+£335
TOYOTA YARIS(2018)	91%	£1137	£190	Grp 8-20	£1582-£5
MINI COOPER S(2019)	92%	£1137	£190	Grp 12-25	£1582-£5
LAND ROVER RANGE ROVER SPORT(2019)	94%	£1327	£190	Grp 18-32	£1772+£185

Estimates based on 7,400 miles/year, current fuel prices, and MOT data. Insurance groups are indicative. Actual costs vary by driver, location, and usage.