Is the 2014 MERCEDES S-CLASS reliable?

Excellent reliability. Very few MOT failures. 92% of MERCEDES S-CLASSs from 2014 passed their MOT first time in 2026, based on 3,915 tests. That's 10 points above the national average of 82%.

How much does a 2014 MERCEDES S-CLASS cost to run?

Estimated annual running cost is £2,607 (£217/month), including £1592 fuel, £760 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2014 MERCEDES S-CLASS?

The 2014 MERCEDES S-CLASS has a 92% MOT pass rate based on 3,915 tests in 2026. This ranks 101 out of 562 cars from 2014.

Which year MERCEDES S-CLASS is most reliable?

The 2020 MERCEDES S-CLASS has the highest MOT pass rate at 95%. The least reliable year is 1992 at 72%.

What is the average mileage for a 2014 MERCEDES S-CLASS?

The average mileage for a 2014 MERCEDES S-CLASS is 95,545 miles, which is in line with the expected 88,800 miles for a 12-year-old car, suggesting normal everyday use.

MERCEDES S-CLASS (2014)

Running costs, reliability data, and common problems from 3,915 real MOT tests.

Annual Cost

£2,607

£217/month

MOT Pass Rate

92%

Excellent

Road Tax

£760

Based on CC/year

Insurance

Grp 35-50

3498cc Hybrid

Great Choice

92% pass rate, £2607/year to run. 10 points above average.

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Hybrid3498cc12 years old3,915 tests96k miles avg

Annual Running Costs

Fuel (Hybrid, 3498cc)

~30 mpg

£1,592

Road Tax

Based on 3498cc

£760

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£2,607

Per month£217/mo

Per week£50/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

92% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 10 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.

At 12 years old, 92% of MERCEDES S-CLASSs from 2014 passed their MOT first time in 2026. That's based on 3,915 tests across the UK. The average mileage at this age is 95,545 miles.

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How Does It Compare?

Rank among 2014 cars101th of 562(top 18%)

Rank among MERCEDES models455th of 1,408(top 32%)

vs national average+10%(82% avg)

vs 2014 cars average+11%(81% avg)

vs MERCEDES average+5%(87% avg)

Mileage Analysis

95,545

Average miles

88,800

Expected for age

The average 2014 MERCEDES S-CLASS has 95,545 miles on the clock, which is in line with the expected 88,800 miles for a 12-year-old car, suggesting normal everyday use.

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Best Year to Buy?

The most reliable year is the 2020 model with a 95% MOT pass rate, while the 1992 model has the lowest at 72%. The 2014 sits between the two at 92%.

MERCEDES S-CLASS by Year

Year	Pass Rate	Tests	Avg Mileage
2021	91%	164	32,036 mi
2020	95%	540	43,972 mi
2019	94%	5,921	67,860 mi
2018	94%	6,518	75,456 mi
2017	93%	5,990	73,988 mi
2016	91%	6,819	74,260 mi
2015	92%	5,513	87,325 mi
2014	92%	3,915	95,545 mi
2013	89%	2,145	108,065 mi
2012	88%	2,817	100,420 mi
2011	87%	2,202	117,628 mi
2010	85%	2,001	110,934 mi
2009	82%	1,990	114,274 mi
2008	84%	2,232	110,584 mi
2007	84%	2,940	117,418 mi
2006	87%	2,334	111,043 mi
2005	84%	1,301	132,014 mi
2004	82%	1,158	124,020 mi
2003	82%	1,227	120,882 mi
2002	79%	720	115,052 mi
2001	79%	735	107,381 mi
2000	81%	562	102,703 mi
1999	78%	434	98,447 mi
1998	81%	522	111,371 mi
1997	86%	373	107,182 mi
1996	83%	348	109,185 mi
1995	86%	286	111,087 mi
1994	92%	140	106,787 mi
1993	76%	49	112,335 mi
1992	72%	121	119,350 mi
1991	92%	118	120,508 mi
1990	87%	125	142,121 mi

Similar Cars to Consider

LEXUS RX

2014 · 3456cc Hybrid

£2,097/year

91%

-1%

LEXUS GS

2016 · 3456cc Hybrid

£2,097/year

94%

+2%

BMW 740

2014 · 3000cc Hybrid

£2,097/year

91%

-1%

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About the 2014 MERCEDES S-CLASS

The 2014 MERCEDES S-CLASS is a performance with a 3498cc hybrid engine. 3,915 of these vehicles were MOT tested in 2026, making it a reasonably common sight on UK roads. It ranks in the top 18% of all 2014 cars for reliability.

With an average of 95,545 miles at 12 years old, MERCEDES S-CLASS owners drive about as much as the UK average.

2014 MERCEDES S-CLASS Fuel Costs

The 3498cc hybrid engine is on the larger side, so fuel won't be this car's strong point. Expect around 30 mpg in mixed driving, which works out to roughly £1,592 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 2014 MERCEDES S-CLASS?

Total estimated annual running cost is £2,607 (£217/month), broken down as £1592 fuel, £760 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 92% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

MERCEDES S-CLASS Reliability Trend

Newer MERCEDES S-CLASSs show better MOT pass rates than older ones, with an average improvement of 6 percentage points.

Buying a Used 2014 MERCEDES S-CLASS

At 12 years old, the MERCEDES S-CLASS is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2020 model has the highest pass rate at 95%.

Common Issues to Watch For

Based on the 2014 MERCEDES S-CLASS's fuel type, age, and engine size, these are the most likely problem areas to check.

Hybrid Battery Health

Watch out

After 12 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.

Rust and Corrosion

Watch out

At 10+ years, check wheel arches, sills, subframe, and brake lines for rust. Structural corrosion is an MOT failure. Prevention is far cheaper than repair.

Suspension Bushings

Watch out

Rubber suspension bushes harden and crack with age, causing knocking noises and vague handling. A full refresh costs £300-£800 depending on the car.

Clutch Wear

Medium risk

With an average of 96k miles, clutch replacement may be due (typical lifespan 60,000-100,000 miles). Budget £400-£800 for a new clutch kit.

Brake Discs and Pads

Medium risk

High-mileage cars often need brake disc replacement, not just pads. A full set of discs and pads costs £200-£500 per axle.

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 2014 MERCEDES S-CLASS stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES S-CLASS(2014)	92%	£1592	£760	Grp 35-50	£2607
LEXUS RX(2014)	91%	£1592	£250	Grp 35-50	£2097-£510
LEXUS GS(2016)	94%	£1592	£250	Grp 35-50	£2097-£510
BMW 740(2014)	91%	£1592	£250	Grp 30-42	£2097-£510

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.