How much does a 2020 MERCEDES B-CLASS cost to run?

Estimated annual running cost is £1,487 (£124/month), including £1037 fuel, £195 road tax, £55 MOT, and £200 predicted repairs.

What is the MOT pass rate for a 2020 MERCEDES B-CLASS?

The 2020 MERCEDES B-CLASS has a 98% MOT pass rate based on 47 tests in 2026. This ranks 169 out of 2596 cars from 2020.

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%.

MERCEDES B-CLASS (2020)

Q: Is the 2020 MERCEDES B-CLASS reliable?

Excellent reliability. Very few MOT failures. 98% of MERCEDES B-CLASSs from 2020 passed their MOT first time in 2026, based on 47 tests. That's 16 points above the national average of 82%.

Q: What is the average mileage for a 2020 MERCEDES B-CLASS?

The average mileage for a 2020 MERCEDES B-CLASS is 23,364 miles, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.

Running costs, reliability data, and common problems from 47 real MOT tests.

Annual Cost

£1,487

£124/month

MOT Pass Rate

98%

Excellent

Road Tax

£195

Flat rate/year

Insurance

Grp 18-32

1950cc Diesel

Great Choice

98% pass rate, £1487/year to run. 16 points above average.

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Diesel1950cc6 years old47 tests23k miles avg

Annual Running Costs

Fuel (Diesel, 1950cc)

~48 mpg

£1,037

Road Tax

Flat rate (post-2017)

£195

MOT Test

£55

Predicted Repairs

Low estimate due to excellent reliability

£200

Total per year£1,487

Per month£124/mo

Per week£29/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

98% MOT pass rate(Excellent)

0%National avg: 82%100%

Excellent reliability. Very few MOT failures. That's 16 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.

At 6 years old, 98% of MERCEDES B-CLASSs from 2020 passed their MOT first time in 2026. That's based on 47 tests across the UK. The average mileage at this age is 23,364 miles.

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How Does It Compare?

Rank among 2020 cars169th of 2,596(top 7%)

Rank among MERCEDES models102th of 1,408(top 7%)

vs national average+16%(82% avg)

vs 2020 cars average+6%(92% avg)

vs MERCEDES average+11%(87% avg)

Mileage Analysis

23,364

Average miles

44,400

Expected for age

The average 2020 MERCEDES B-CLASS has 23,364 miles on the clock, which is below the expected 44,400 miles for a 6-year-old car. This suggests lighter use than average, which generally means less wear on major components.

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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 2020 sits between the two at 98%.

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

VOLKSWAGEN GOLF

2018 · 1968cc Diesel

£1,482/year

92%

-6%

FORD FOCUS

2019 · 1499cc Diesel

£1,500/year

89%

-9%

MERCEDES A

2019 · 1461cc Diesel

£1,350/year

91%

-7%

MERCEDES A-CLASS

2018 · 1461cc Diesel

£1,500/year

89%

-9%

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About the 2020 MERCEDES B-CLASS

The 2020 MERCEDES B-CLASS is a family car with a 1950cc diesel engine. 47 of these vehicles were MOT tested in 2026, making it a rare model on UK roads. It ranks in the top 7% of all 2020 cars for reliability.

With an average of 23,364 miles at 6 years old, MERCEDES B-CLASS owners tend to use this car less than the typical driver.

2020 MERCEDES B-CLASS Fuel Costs

The 1950cc diesel engine offers a reasonable balance between performance and economy. Expect around 48 mpg in mixed driving, which works out to roughly £1,037 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 2020 MERCEDES B-CLASS?

Total estimated annual running cost is £1,487 (£124/month), broken down as £1037 fuel, £195 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 98% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.

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 2020 MERCEDES B-CLASS

At 6 years old, the MERCEDES B-CLASS offers good value with plenty of life remaining. Most manufacturer warranties will have expired, so a pre-purchase inspection is worth the cost. If you're flexible on year, the 2019 model has the highest pass rate at 93%. Note: with only 47 tests in our data, these figures should be treated as indicative rather than definitive.

Common Issues to Watch For

Based on the 2020 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

Medium risk

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

AdBlue System

Medium risk

Post-2015 diesels use AdBlue for emissions. Sensor failures and tank heater issues are common. Budget £200-£500 for repairs.

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.

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 2020 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(2020)	98%	£1037	£195	Grp 18-32	£1487
VOLKSWAGEN GOLF(2018)	92%	£1037	£190	Grp 18-32	£1482-£5
FORD FOCUS(2019)	89%	£905	£190	Grp 12-25	£1500+£13
MERCEDES A(2019)	91%	£905	£190	Grp 12-25	£1350-£137
MERCEDES A-CLASS(2018)	89%	£905	£190	Grp 12-25	£1500+£13

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.