MERCEDES GLB 200 AMG LINE AUTO (2021)
Running costs, common problems, and reliability data based on 2,208 real MOT tests in 2024.
MOT Pass Rate
94%
Total Tests (2024)
2,208
Avg Mileage
28,166 mi
Est. Annual Cost
£1,582
Is the 2021 MERCEDES GLB 200 AMG LINE AUTO 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 200 AMG LINE AUTOs from 2021 passed their MOT first time in 2024. That's based on 2,208 tests across the UK. The average mileage at this age is 28,166 miles.
How does the 2021 MERCEDES GLB 200 AMG LINE AUTO compare?
Mileage Analysis
The average 2021 MERCEDES GLB 200 AMG LINE AUTO has 28,166 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 200 AMG LINE AUTO?
The most reliable year is the 2022 model with a 95% MOT pass rate, while the 2020 model has the lowest at 93%. The 2021 sits between the two at 94%.
How much does a 2021 MERCEDES GLB 200 AMG LINE AUTO 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 200 AMG LINE AUTO by Year
Checking a specific MERCEDES GLB 200 AMG LINE AUTO?
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About the 2021 MERCEDES GLB 200 AMG LINE AUTO
The 2021 MERCEDES GLB 200 AMG LINE AUTO is a small family car with a 1332cc petrol engine. 2,208 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. Among all cars from 2021, the average MOT pass rate is 92%, and this model beats that benchmark.
With an average of 28,166 miles at 3 years old, MERCEDES GLB 200 AMG LINE AUTO owners cover more miles than the average driver.
2021 MERCEDES GLB 200 AMG LINE AUTO Fuel Costs
The 1332cc petrol engine offers a reasonable balance between performance and economy. Expect around 42 mpg in mixed driving, which works out to roughly £1,137 per year at current petrol prices of 142p per litre (based on 7,400 miles per year).
What does it cost to own a 2021 MERCEDES GLB 200 AMG LINE AUTO?
Total estimated annual running cost is £1,582 (£132/month), broken down as £1137 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 200 AMG LINE AUTO Reliability Trend
The MERCEDES GLB 200 AMG LINE AUTO has maintained consistent MOT pass rates across model years, varying by only 2 percentage points.
Buying a Used 2021 MERCEDES GLB 200 AMG LINE AUTO
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 95%.
Alternatives to the 2021 MERCEDES GLB 200 AMG LINE AUTO
The MERCEDES GLB 200 AMG LINE AUTO is actually the most reliable option among similar petrol small family cars from this era. Here are comparable petrol cars with similar engines:
- FORD FIESTA (2019) 91% pass rate (-3%) from 124,950 tests
- VOLKSWAGEN GOLF (2019) 92% pass rate (-2%) from 89,653 tests
- VAUXHALL CORSA (2019) 88% pass rate (-6%) from 68,639 tests
- NISSAN QASHQAI (2020) 93% pass rate (-1%) from 52,321 tests