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MERCEDES B-CLASS (2009)

Running costs, common problems, and reliability data based on 8,277 real MOT tests in 2024.

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MOT Pass Rate

74%

Total Tests (2024)

8,277

Avg Mileage

95,335 mi

Est. Annual Cost

£1,727

Is the 2009 MERCEDES B-CLASS reliable?

Average reliability. Expect some repairs as it ages. That's 8 points below the national average of 82%. It falls below the MERCEDES brand average of 87%.

At 15 years old, 74% of MERCEDES B-CLASSs from 2009 passed their MOT first time in 2024. That's based on 8,277 tests across the UK. The average mileage at this age is 95,335 miles.

How does the 2009 MERCEDES B-CLASS compare?

Rank among all 2009 cars348th out of 575(top 61%)
Rank among all MERCEDES models1278th out of 1,408(top 91%)
vs national average-8% (82% avg)
vs 2009 cars average-1% (75% avg)
vs MERCEDES average-13% (87% avg)

Mileage Analysis

The average 2009 MERCEDES B-CLASS has 95,335 miles on the clock, which is in line with the expected 111,000 miles for a 15-year-old car, suggesting normal everyday use.

Best year to buy a MERCEDES B-CLASS?

The most reliable year is the 2019 model with a 93% MOT pass rate, while the 2006 model has the lowest at 71%. The 2009 sits between the two at 74%.

How much does a 2009 MERCEDES B-CLASS cost to run?

⛽Fuel (Diesel, 1991cc)
£1,037
🏛️Road Tax
£135
🔧MOT Test
£55
🛠️Predicted Repairs

Higher than average due to low pass rate

£500
Total per year£1,727
Per month£144/mo

Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.

MERCEDES B-CLASS by Year

YearPass RateTestsAvg Mileage
202098%4723,364 mi
201993%91229,781 mi
201890%6,72939,021 mi
201788%9,69348,392 mi
201687%9,65755,381 mi
201586%9,87164,066 mi
201483%15,38272,344 mi
201382%13,42178,118 mi
201281%11,09283,827 mi
201173%6,77984,302 mi
201074%8,81990,612 mi
200974%8,27795,335 mi
200871%6,925100,673 mi
200772%5,184101,539 mi
200671%4,235103,535 mi
200573%805105,799 mi

Checking a specific MERCEDES B-CLASS?

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About the 2009 MERCEDES B-CLASS

The 2009 MERCEDES B-CLASS is a family car with a 1991cc diesel engine. 8,277 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. Among all cars from 2009, the average MOT pass rate is 75%, and this model falls short of that benchmark.

With an average of 95,335 miles at 15 years old, MERCEDES B-CLASS owners drive about as much as the UK average.

2009 MERCEDES B-CLASS Fuel Costs

The 1991cc 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 2009 MERCEDES B-CLASS?

Total estimated annual running cost is £1,727 (£144/month), broken down as £1037 fuel, £135 road tax, £55 MOT, and £500 predicted repairs. Repair costs are moderate, reflecting the 74% 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 2009 MERCEDES B-CLASS

At 15 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 8,277 MOT tests in our data, there's strong statistical confidence in these figures.

Alternatives to the 2009 MERCEDES B-CLASS

If reliability is your priority, there are 2 similar cars with a higher MOT pass rate. Here are comparable diesel cars with similar engines: