Mercedes B-Class (2015)

Estimated running costs and MOT pass rates from 9,871 MOT tests in 2024.

Annual Cost

£980

£82/month

MOT Pass Rate

86%

Good

Road Tax

£20

Estimated/year

Est. Insurance

n/a

Electric

Solid Option

86% pass rate, £980/year to run. Close to the average across all models.

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Electric11 years old9,871 tests64k miles avg

Annual Running Costs

Electricity

Home charging at about 7.5p a mile

£555

Road Tax

Band A (zero emission)

£20

MOT Test

£55

Predicted Repairs

£350

Total per year£980

Per month£82/mo

Per week£19/wk

Estimates based on 7,400 miles/year (UK average), home charging at about 7.5p a mile, GOV.UK road tax rates and repair likelihood from MOT data. Insurance not included.

Reliability Verdict

86% 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.

86% of MOT tests on Mercedes B-Classs from 2015 ended in a pass in 2024, when they were about 9 years old. That's based on 9,871 tests across the UK, retests included. The average mileage recorded at those tests was 64,066 miles.

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How Does It Compare?

Rank among 2015 models247th of 515(top half)

Rank among Mercedes models840th of 1,376(bottom half)

vs average of all models+4%(82% avg)

vs 2015 models average+3%(83% avg)

vs Mercedes average-1%(87% avg)

Mileage Analysis

64,066

Average miles

66,600

Expected for age

The average 2015 Mercedes B-Class had 64,066 miles on the clock at its 2024 MOT, which is in line with the expected 66,600 miles for a 9-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 2015 scores 86%. 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

Smart (MCC) Fortwo

2017 · Electric

£1,160/year

88%

+2%

Nissan Leaf

2017 · Electric

£1,160/year

85%

-1%

BMW i3

2017 · Electric

£1,010/year

90%

+4%

Tesla Model S

2017 · Electric

£1,160/year

86%

same

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About the 2015 Mercedes B-Class

The 2015 Mercedes B-Class is a premium car. Our records list this model year as electric, but most of the model's other years are petrol or diesel, so the fuel type and running costs here may be wrong. 9,871 MOT tests were recorded on this model in 2024, making it a reasonably common sight on UK roads. Among all models from 2015, the average MOT pass rate is 83%, and this model beats that benchmark.

With an average of 64,066 miles recorded at its 2024 MOT tests, Mercedes B-Class owners drive about as much as the UK average.

What does it cost to own a 2015 Mercedes B-Class?

Total estimated annual running cost is £980 (£82/month), broken down as £555 electricity, £20 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 86% 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 2015 Mercedes B-Class

At 11 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 9,871 MOT tests in our data, there's strong statistical confidence in these figures.

What the 2015 Mercedes B-Class Fails Its MOT On

Share of the 1,323 MOT tests on the 2015 Mercedes B-Class that failed at the first attempt in 2025, next to all cars and vans of the same age.

Suspension35%
Same age: 32%
Tyres32%
Same age: 25% (fails on this more often)
Lights and electrics31%
Same age: 33%
Brakes13%
Same age: 21% (fails on this less often)

DVSA anonymised MOT data for 2025; a test that failed on two areas counts in both. How we count it · Mercedes B-Class reliability, common problems and years to avoid

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.

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 2015 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(2015)	86%	£555	£20	n/a	£980
Smart (MCC) Fortwo(2017)	88%	£555	£200	n/a	£1,160+£180
Nissan Leaf(2017)	85%	£555	£200	n/a	£1,160+£180
BMW i3(2017)	90%	£555	£200	n/a	£1,010+£30
Tesla Model S(2017)	86%	£555	£200	n/a	£1,160+£180

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 2015 Mercedes B-Class

Is the 2015 Mercedes B-Class reliable?

Good reliability. Occasional issues but generally solid. 86% of MOT tests on 2015 Mercedes B-Classs ended in a pass, from 9,871 tests (DVSA MOT data for tests in 2024, retests included). That's 4 points above the average of 82% across all models in the same data.

How much does a 2015 Mercedes B-Class cost to run?

Our estimate is £980 a year (£82 a month): £555 electricity, £20 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 2015 Mercedes B-Class?

86% of 9,871 MOT tests on the 2015 Mercedes B-Class ended in a pass (DVSA MOT data for tests in 2024, retests included). That ranks it 247th of 515 models first registered in 2015 (top 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 2015 Mercedes B-Class?

The average mileage recorded at MOT tests on the 2015 Mercedes B-Class is 64,066 miles, which is in line with the expected 66,600 miles for a 9-year-old car, suggesting normal everyday use.