How much does a 2012 MERCEDES B-CLASS cost to run?

Estimated annual running cost is £1,475 (£123/month), including £905 fuel, £165 road tax, £55 MOT, and £350 predicted repairs.

What is the MOT pass rate for a 2012 MERCEDES B-CLASS?

The 2012 MERCEDES B-CLASS has a 81% MOT pass rate based on 11,092 tests in 2026. This ranks 362 out of 685 cars from 2012.

Which year MERCEDES B-CLASS is most reliable?

The 2019 MERCEDES B-CLASS has the highest MOT pass rate at 93%. The least reliable year is 2006 at 71%.

What is the average mileage for a 2012 MERCEDES B-CLASS?

The average mileage for a 2012 MERCEDES B-CLASS is 83,827 miles, which is in line with the expected 103,600 miles for a 14-year-old car, suggesting normal everyday use.

MERCEDES B-CLASS (2012)

Q: Is the 2012 MERCEDES B-CLASS reliable?

Good reliability. Occasional issues but generally solid. 81% of MERCEDES B-CLASSs from 2012 passed their MOT first time in 2026, based on 11,092 tests. That's 1 points below the national average of 82%.

Running costs, reliability data, and common problems from 11,092 real MOT tests.

Annual Cost

£1,475

£123/month

MOT Pass Rate

81%

Good

Road Tax

£165

Based on CC/year

Insurance

Grp 12-25

1596cc Diesel

Solid Option

81% pass rate, £1475/year to run. Close to the national average.

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Diesel1596cc14 years old11,092 tests84k miles avg

Annual Running Costs

Fuel (Diesel, 1596cc)

~55 mpg

£905

Road Tax

Based on 1596cc

£165

MOT Test

£55

Predicted Repairs

£350

Total per year£1,475

Per month£123/mo

Per week£28/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

81% MOT pass rate(Good)

0%National avg: 82%100%

Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.

At 14 years old, 81% of MERCEDES B-CLASSs from 2012 passed their MOT first time in 2026. That's based on 11,092 tests across the UK. The average mileage at this age is 83,827 miles.

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How Does It Compare?

Rank among 2012 cars362th of 685(top 53%)

Rank among MERCEDES models1033th of 1,408(top 73%)

vs national average-1%(82% avg)

vs 2012 cars average+3%(78% avg)

vs MERCEDES average-6%(87% avg)

Mileage Analysis

83,827

Average miles

103,600

Expected for age

The average 2012 MERCEDES B-CLASS has 83,827 miles on the clock, which is in line with the expected 103,600 miles for a 14-year-old car, suggesting normal everyday use.

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Best Year to Buy?

The most reliable year is the 2019 model with a 93% MOT pass rate, while the 2006 model has the lowest at 71%. The 2012 sits between the two at 81%.

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

£1,490/year

77%

-4%

VOLKSWAGEN GOLF

2014 · 1598cc Diesel

£1,445/year

87%

+6%

VAUXHALL ASTRA

2013 · 1700cc Diesel

£1,727/year

79%

-2%

VOLKSWAGEN POLO

2014 · 1199cc Diesel

£1,340/year

80%

-1%

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About the 2012 MERCEDES B-CLASS

The 2012 MERCEDES B-CLASS is a small family car with a 1596cc diesel engine. 11,092 of these vehicles were MOT tested in 2026, making it one of the most commonly tested cars on UK roads. Among all cars from 2012, the average MOT pass rate is 78%, and this model beats that benchmark.

With an average of 83,827 miles at 14 years old, MERCEDES B-CLASS owners drive about as much as the UK average.

2012 MERCEDES B-CLASS Fuel Costs

The 1596cc diesel engine offers a reasonable balance between performance and economy. Expect around 55 mpg in mixed driving, which works out to roughly £905 per year at current diesel prices of 148p per litre (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 2012 MERCEDES B-CLASS?

Total estimated annual running cost is £1,475 (£123/month), broken down as £905 fuel, £165 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 81% pass rate. Keeping on top of servicing will help avoid surprises.

MERCEDES B-CLASS Reliability Trend

Newer MERCEDES B-CLASSs show better MOT pass rates than older ones, with an average improvement of 14 percentage points.

Buying a Used 2012 MERCEDES B-CLASS

At 14 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 11,092 MOT tests in our data, there's strong statistical confidence in these figures.

Common Issues to Watch For

Based on the 2012 MERCEDES B-CLASS's fuel type, age, and engine size, these are the most likely problem areas to check.

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.

Clutch Wear

Medium risk

With an average of 84k 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 2012 MERCEDES B-CLASS stacks up against similar cars for annual running costs, insurance, and tax.

Car	Pass Rate	Fuel/yr	Tax/yr	Insurance	Total/yr
MERCEDES B-CLASS(2012)	81%	£905	£165	Grp 12-25	£1475
FORD FIESTA(2013)	77%	£905	£30	Grp 8-20	£1490+£15
VOLKSWAGEN GOLF(2014)	87%	£905	£135	Grp 12-25	£1445-£30
VAUXHALL ASTRA(2013)	79%	£1037	£135	Grp 18-32	£1727+£252
VOLKSWAGEN POLO(2014)	80%	£905	£30	Grp 5-15	£1340-£135

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.