MERCEDES GLB 220 AMG LINE PREM D 4M A (2021)
Running costs, common problems, and reliability data based on 1,690 real MOT tests in 2024.
MOT Pass Rate
94%
Total Tests (2024)
1,690
Avg Mileage
29,245 mi
Est. Annual Cost
£1,482
Is the 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A reliable?
Excellent reliability. Very few MOT failures. That's 12 points above the national average of 82%. It also outperforms the MERCEDES brand average of 87%.
At 3 years old, 94% of MERCEDES GLB 220 AMG LINE PREM D 4M As from 2021 passed their MOT first time in 2024. That's based on 1,690 tests across the UK. The average mileage at this age is 29,245 miles.
How does the 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A compare?
Mileage Analysis
The average 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A has 29,245 miles on the clock, which is above the expected 22,200 miles for a 3-year-old car. Higher-mileage cars often have more motorway miles, which is generally less harmful than stop-start urban driving.
Best year to buy a MERCEDES GLB 220 AMG LINE PREM D 4M A?
The most reliable year is the 2022 model with a 100% MOT pass rate, while the 2020 model has the lowest at 92%. The 2021 sits between the two at 94%.
How much does a 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES GLB 220 AMG LINE PREM D 4M A by Year
Checking a specific MERCEDES GLB 220 AMG LINE PREM D 4M A?
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About the 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A
The 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A is a family car with a 1950cc diesel engine. 1,690 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. It ranks in the top 15% of all 2021 cars for reliability.
With an average of 29,245 miles at 3 years old, MERCEDES GLB 220 AMG LINE PREM D 4M A owners cover more miles than the average driver.
2021 MERCEDES GLB 220 AMG LINE PREM D 4M A 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).
What does it cost to own a 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A?
Total estimated annual running cost is £1,482 (£124/month), broken down as £1037 fuel, £190 road tax, £55 MOT, and £200 predicted repairs. The low repair estimate reflects the excellent 94% pass rate. These cars rarely fail their MOT, so unexpected bills are less likely.
MERCEDES GLB 220 AMG LINE PREM D 4M A Reliability Trend
Newer MERCEDES GLB 220 AMG LINE PREM D 4M As show better MOT pass rates than older ones, with an average improvement of 5 percentage points.
Buying a Used 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A
At 3 years old, this is still relatively fresh. You may find examples with remaining manufacturer warranty. Depreciation is slowing but hasn't bottomed out yet. If you're flexible on year, the 2022 model has the highest pass rate at 100%.
Alternatives to the 2021 MERCEDES GLB 220 AMG LINE PREM D 4M A
The MERCEDES GLB 220 AMG LINE PREM D 4M A is actually the most reliable option among similar diesel family cars from this era. Here are comparable diesel cars with similar engines:
- FORD FOCUS (2019) 89% pass rate (-5%) from 93,803 tests
- MERCEDES A (2019) 91% pass rate (-3%) from 89,588 tests
- FORD KUGA (2019) 91% pass rate (-3%) from 72,831 tests
- VOLKSWAGEN POLO (2019) 89% pass rate (-5%) from 65,751 tests