Mercedes B-Class (2014)

Estimated running costs and MOT pass rates from 15,382 MOT tests in 2024.

Annual Cost

£2,077

£173/month

MOT Pass Rate

83%

Good

Road Tax

£275

Estimated/year

Est. Insurance

Grp 18-32

1796cc Diesel

Solid Option

83% pass rate, £2,077/year to run. Close to the average across all models.

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Diesel1796cc12 years old15,382 tests72k miles avg

Annual Running Costs

Fuel (Diesel, 1796cc)

~48 mpg

£1,397

Road Tax

Estimated CO2 band

£275

MOT Test

£55

Predicted Repairs

£350

Total per year£2,077

Per month£173/mo

Per week£40/wk

Estimates based on 7,400 miles/year (UK average), diesel at 199.33p a litre (GOV.UK weekly average, week of 19 October 2026), GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included.

Reliability Verdict

83% MOT pass rate(Good)

0%All-model avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the average of 82% across all models in our data. It falls below the Mercedes brand average of 87%.

83% of MOT tests on Mercedes B-Classs from 2014 ended in a pass in 2024, when they were about 10 years old. That's based on 15,382 tests across the UK, retests included. The average mileage recorded at those tests was 72,344 miles.

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How Does It Compare?

Rank among 2014 models300th of 527(bottom half)

Rank among Mercedes models949th of 1,376(bottom half)

vs average of all models+1%(82% avg)

vs 2014 models average+2%(81% avg)

vs Mercedes average-4%(87% avg)

Mileage Analysis

72,344

Average miles

74,000

Expected for age

The average 2014 Mercedes B-Class had 72,344 miles on the clock at its 2024 MOT, which is in line with the expected 74,000 miles for a 10-year-old car, suggesting normal everyday use.

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Best Year to Buy?

Of the years with at least 100 tests, the 2019 model has the highest MOT pass rate at 93%, while the 2006 model has the lowest at 71%. The 2014 scores 83%. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.

Mercedes B-Class by Year

Year	Pass Rate	Tests	Avg Mileage
2020	98%	47	23,364 mi
2019	93%	912	29,781 mi
2018	90%	6,729	39,021 mi
2017	88%	9,693	48,392 mi
2016	87%	9,657	55,381 mi
2015	86%	9,871	64,066 mi
2014	83%	15,382	72,344 mi
2013	82%	13,421	78,118 mi
2012	81%	11,092	83,827 mi
2011	73%	6,779	84,302 mi
2010	74%	8,819	90,612 mi
2009	74%	8,277	95,335 mi
2008	71%	6,925	100,673 mi
2007	72%	5,184	101,539 mi
2006	71%	4,235	103,535 mi
2005	73%	805	105,799 mi

Similar Cars to Consider

Ford Fiesta

2013 · 1399cc Diesel

£1,944/year

77%

-6%

Volkswagen Golf

2015 · 1968cc Diesel

£2,077/year

89%

+6%

Vauxhall Astra

2013 · 1700cc Diesel

£2,227/year

79%

-4%

Audi A3

2015 · 1598cc Diesel

£1,794/year

88%

+5%

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About the 2014 Mercedes B-Class

The 2014 Mercedes B-Class is a premium car. Our records list a 1796cc diesel engine, though engines vary between versions. 15,382 MOT tests were recorded on this model in 2024, making it one of the most commonly tested models on UK roads. Among all models from 2014, the average MOT pass rate is 81%, and this model beats that benchmark.

With an average of 72,344 miles recorded at its 2024 MOT tests, Mercedes B-Class owners drive about as much as the UK average.

2014 Mercedes B-Class Fuel Costs

The 1796cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,397 per year with diesel at 199.33p per litre (GOV.UK weekly average, week of 19 October 2026; based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.

What does it cost to own a 2014 Mercedes B-Class?

Total estimated annual running cost is £2,077 (£173/month), broken down as £1,397 fuel, £275 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 83% pass rate. Keeping on top of servicing will help avoid surprises.

Mercedes B-Class Reliability Trend

Newer Mercedes B-Classs pass their MOT more often than older ones, by 14 percentage points on average, which is mostly down to age and wear.

Buying a Used 2014 Mercedes B-Class

At 12 years old, the Mercedes B-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 2019 model has the highest pass rate at 93%. With 15,382 MOT tests in our data, there's strong statistical confidence in these figures.

Common Issues to Watch For

These are typical issues for cars of this age, fuel type and engine size, not faults recorded on this model's MOT tests. Use them as a checklist when you view one.

DPF (Diesel Particulate Filter)

Watch out

Short journeys clog the DPF. Replacement costs £1,000-£2,500. Check the DPF warning light and ask about driving patterns.

Turbo Wear

Watch out

Diesel turbos work harder and wear faster. Listen for whining noises and check for oil leaks around the turbo housing.

EGR Valve

Watch out

Exhaust Gas Recirculation valves clog with carbon deposits, causing rough running and poor economy. Cleaning costs £150-£300, replacement £300-£600.

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.

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 B-Class stacks up against similar cars for estimated annual running costs, insurance group, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Est. Ins. Group	Total/yr
Mercedes B-Class(2014)	83%	£1,397	£275	Grp 18-32	£2,077
Ford Fiesta(2013)	77%	£1,219	£170	Grp 8-20	£1,944-£133
Volkswagen Golf(2015)	89%	£1,397	£275	Grp 18-32	£2,077same
Vauxhall Astra(2013)	79%	£1,397	£275	Grp 18-32	£2,227+£150
Audi A3(2015)	88%	£1,219	£170	Grp 12-25	£1,794-£283

Estimates based on 7,400 miles/year, GOV.UK average pump prices for the week of 19 October 2026, GOV.UK road tax rates and MOT data. Insurance groups are our rough estimate from engine size, not official groups. Actual costs vary by driver, location, and usage.

Questions about the 2014 Mercedes B-Class

Is the 2014 Mercedes B-Class reliable?

Good reliability. Occasional issues but generally solid. 83% of MOT tests on 2014 Mercedes B-Classs ended in a pass, from 15,382 tests (DVSA MOT data for tests in 2024, retests included). That's 1 point above the average of 82% across all models in the same data.

How much does a 2014 Mercedes B-Class cost to run?

Our estimate is £2,077 a year (£173 a month): £1,397 fuel, £275 road tax, £55 MOT and £350 predicted repairs, based on 7,400 miles a year. Insurance is not included.

What is the MOT pass rate for a 2014 Mercedes B-Class?

83% of 15,382 MOT tests on the 2014 Mercedes B-Class ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 300th of 527 models first registered in 2014 (bottom half).

Which year Mercedes B-Class has the best MOT pass rate?

Of the years with at least 100 tests, the 2019 Mercedes B-Class has the highest MOT pass rate at 93% and the 2006 the lowest at 71%. Newer cars usually pass more often simply because they are younger and have done fewer miles.

What is the average mileage for a 2014 Mercedes B-Class?

The average mileage recorded at MOT tests on the 2014 Mercedes B-Class is 72,344 miles, which is in line with the expected 74,000 miles for a 10-year-old car, suggesting normal everyday use.