Mercedes-Benz B-Class reliability and MOT data
Time Period & Model
Time period snapshot: Last 5 years
Manufacturer: Mercedes-Benz
Model: B-Class
Model reliability rank
53
MOT-based rank from 413,676 selected-period tests.
Overall MOT pass rate
77.5%
Share of this model's 413,676 selected-period MOT tests that pass.
Efficiency, emissions & tax
Average MPG
100.9 mpg
CO2 emission
97 g/km
Euro emissions
Euro 6
Tax cost
£125/yr
Average vehicle miles
84,120
Moderate average mileage in the current pool.
Life expectancy miles
89,688
Lower mature-fleet mileage expectation.
Average vehicle age
12.6
Comfortable mid-life age pattern.
Market share
0.14%
0.14% share within the active represented vehicle pool.
Vehicles represented
56,949
56,947 valid MOT, 2 under 3 years.
Tests analysed
413,676
413,676 MOT tests in the selected period.
Rarity ranking
Based on Make & Model
Uncommon
56,949On the road
Insight summary
Mercedes-Benz B-Class is an uncommon model in this snapshot, with 56,949 represented vehicles and 0.14% of the active UK pool tracked by AutoRank. For the last 5 years, it has a pass rate of 77.5% from 413,676 MOT tests, with a reliability score of 53. The current pool shows an average of 84,120 miles and an average age of 12.6 years, while mature-fleet mileage is estimated at 89,688 miles. Diesel leads the fuel split, followed by petrol, and the most frequent defect themes are coil springs, windscreen damage and engine warning light. The practical read is that the Mercedes-Benz B-Class looks like a solid used-car baseline rather than a rare find, with age, mileage and common wear items doing most of the explaining.
Fuel type breakdown (by model)
| Fuel | Vehicles |
|---|---|
| DIESEL | 38,689 |
| PETROL | 17,893 |
| ELECTRIC | 365 |
| HYBRID ELECTRIC (CLEAN) | 1 |
| LPG | 1 |
Euro NCAP Safety
Adult
96%
Children
90%
Pedestrian
78%
Safety systems
75%
No NCAP tests found for this model.
Top 25 most common defects (by model)
| Defect | Count |
|---|---|
| Offside Rear Coil spring fractured or broken (5.3.1 (b) (i)) | 5,309 |
| Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i)) | 5,283 |
| Nearside Rear Coil spring fractured or broken (5.3.1 (b) (i)) | 5,017 |
| Engine MIL inoperative or indicates a malfunction (8.2.1.2 (h)) | 4,179 |
| Offside Front Anti-roll bar linkage ball joint dust cover severely deteriorated (5.3.4 (b) (i)) | 3,994 |
| Nearside Front Anti-roll bar linkage ball joint dust cover severely deteriorated (5.3.4 (b) (i)) | 3,953 |
| Offside Front Outer Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i)) | 3,754 |
| Parking brake efficiency below requirements (1.4.2 (a) (i)) | 3,387 |
| Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g)) | 3,316 |
| Supplementary restraint system warning lamp indicates a fault (7.1.6 (a)) | 3,163 |
| Offside Front Anti-roll bar linkage ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 3,139 |
| Nearside Front Anti-roll bar linkage ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii)) | 3,093 |
| Nearside Front Outer Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i)) | 2,689 |
| Windscreen washer provides insufficient washer liquid (3.5 (a)) | 2,668 |
| Registration plate lamp inoperative in the case of a single lamp or all lamps (4.7.1 (b) (ii)) | 2,569 |
| Nearside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e)) | 2,348 |
| Nearside Registration plate lamp inoperative in the case of multiple lamps or light sources (4.7.1 (b) (i)) | 2,336 |
| Offside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e)) | 2,048 |
| Nearside Rear Brake pipe excessively corroded (1.1.11 (c)) | 2,047 |
| Offside Front Outer Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt (6.1.7 (g) (ii)) | 2,012 |
| Offside Front Anti-roll bar ball joint dust cover severely deteriorated (5.3.4 (b) (i)) | 1,889 |
| Nearside Rear Registration plate lamp inoperative in the case of multiple lamps or light sources (4.7.1 (b) (i)) | 1,882 |
| Service brake efficiency below requirements (1.2.2 (a) (i)) | 1,875 |
| Offside Front Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i)) | 1,865 |
| Offside Front Suspension arm ball joint excessively worn (5.3.4 (a) (i)) | 1,841 |
01
Offside Rear Coil spring fractured or broken (5.3.1 (b) (i))
7.0% of displayed top 25
5,309
02
Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))
7.0% of displayed top 25
5,283
03
Nearside Rear Coil spring fractured or broken (5.3.1 (b) (i))
6.6% of displayed top 25
5,017
04
Engine MIL inoperative or indicates a malfunction (8.2.1.2 (h))
5.5% of displayed top 25
4,179
05
Offside Front Anti-roll bar linkage ball joint dust cover severely deteriorated (5.3.4 (b) (i))
5.3% of displayed top 25
3,994
06
Nearside Front Anti-roll bar linkage ball joint dust cover severely deteriorated (5.3.4 (b) (i))
5.2% of displayed top 25
3,953
07
Offside Front Outer Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i))
5.0% of displayed top 25
3,754
08
Parking brake efficiency below requirements (1.4.2 (a) (i))
4.5% of displayed top 25
3,387
09
Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g))
4.4% of displayed top 25
3,316
10
Supplementary restraint system warning lamp indicates a fault (7.1.6 (a))
4.2% of displayed top 25
3,163
11
Offside Front Anti-roll bar linkage ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii))
4.1% of displayed top 25
3,139
12
Nearside Front Anti-roll bar linkage ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii))
4.1% of displayed top 25
3,093
13
Nearside Front Outer Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i))
3.6% of displayed top 25
2,689
14
Windscreen washer provides insufficient washer liquid (3.5 (a))
3.5% of displayed top 25
2,668
15
Registration plate lamp inoperative in the case of a single lamp or all lamps (4.7.1 (b) (ii))
3.4% of displayed top 25
2,569
16
Nearside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))
3.1% of displayed top 25
2,348
17
Nearside Registration plate lamp inoperative in the case of multiple lamps or light sources (4.7.1 (b) (i))
3.1% of displayed top 25
2,336
18
Offside Front Tyre tread depth below requirements of 1.6mm (5.2.3 (e))
2.7% of displayed top 25
2,048
19
Nearside Rear Brake pipe excessively corroded (1.1.11 (c))
2.7% of displayed top 25
2,047
20
Offside Front Outer Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt (6.1.7 (g) (ii))
2.7% of displayed top 25
2,012
21
Offside Front Anti-roll bar ball joint dust cover severely deteriorated (5.3.4 (b) (i))
2.5% of displayed top 25
1,889
22
Nearside Rear Registration plate lamp inoperative in the case of multiple lamps or light sources (4.7.1 (b) (i))
2.5% of displayed top 25
1,882
23
Service brake efficiency below requirements (1.2.2 (a) (i))
2.5% of displayed top 25
1,875
24
Offside Front Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i))
2.5% of displayed top 25
1,865
25
Offside Front Suspension arm ball joint excessively worn (5.3.4 (a) (i))
2.4% of displayed top 25
1,841
Last 5 years
Reliability rank breakdown
Mercedes-Benz B-Class reliability, calculated from MOT results for this static model view.