MG B reliability, MOT pass rate and rarity

Time Period & Model

Time period snapshot: Last 5 years

Manufacturer: MG

Model: B

Model reliability rank

MOT-based rank from 15,965 selected-period tests.

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Overall MOT pass rate

82.9%

Share of this model's 15,965 selected-period MOT tests that pass.

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Efficiency, emissions & tax

Average MPG

CO2 emission

Euro emissions

Tax cost

£365/yr

Average vehicle miles

43,271

Lower average mileage in the analysed fleet.

Life expectancy miles

43,271

Lower mature-fleet mileage expectation.

Average vehicle age

50.2

Older average age in the represented fleet.

Vehicles represented

2,253

2,253 valid MOT, 0 under 3 years.

Tests analysed

15,965

15,965 MOT tests in the selected period.

Rarity ranking

Based on Make & Model

Very Rare

2,253On the road

Insight summary

MG B is a very rare model in this snapshot, with 2,253 represented vehicles and 0.01% of the active UK pool tracked by AutoRank. For the last 5 years, it has a pass rate of 82.9% from 15,965 MOT tests, with a reliability score of 67. The current pool shows an average of 43,271 miles and an average age of 50.2 years, while mature-fleet mileage is estimated at 43,271 miles. Petrol leads the fuel split, followed by electric, and the most frequent defect themes are exhaust emissions, braking components and windscreen damage. The practical read is that the MG B looks a little better than average, but still rewards careful checks on mileage and maintenance.

Fuel type breakdown (by model)

Fuel	Vehicles
PETROL	2,252
ELECTRIC	1

Euro NCAP Safety

No NCAP tests found for this model.

Top 25 most common defects (by model)

Defect	Count
Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))	322
Rear Brakes imbalanced across an axle Axle 2 (1.2.1 (b) (i))	248
Windscreen washer not working (3.5 (a))	210
Horn not working (7.7 (a))	203
Parking brake efficiency below requirements (1.4.2 (a) (i))	165
Stop lamp(s) all not working (4.3.1 (a) (iii))	152
Exhaust emissions hydrocarbon content excessive (8.2.1.2 (b))	144
Windscreen washer provides insufficient washer liquid (3.5 (a))	135
Nearside Front Position lamp not working (4.2.1 (a) (ii))	119
Offside Front Position lamp not working (4.2.1 (a) (ii))	103
Offside Rear Service brake excessively binding (1.2.1 (f))	100
Nearside Rear Service brake excessively binding (1.2.1 (f))	78
Nearside Headlamp aim too low (4.1.2 (a))	75
Nearside Steering rack gaiter missing or no longer prevents the ingress of dirt (2.1.3 (g) (ii))	74
Offside Steering rack gaiter missing or no longer prevents the ingress of dirt (2.1.3 (g) (ii))	72
Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))	70
All direction indicators not working (4.4.1 (a) (ii))	69
Nearside Rear Position lamp not working (4.2.1 (a) (ii))	69
Offside Headlamp aim too low (4.1.2 (a))	67
Offside Rear Position lamp not working (4.2.1 (a) (ii))	66
Nearside Steering rack gaiter damaged or deteriorated, but preventing the ingress of dirt (2.1.3 (g) (i))	65
Parking (secondary brake) on a single line braking system imbalanced across an axle Axle 1 (1.3.1 (b) (i))	63
Offside Front Track rod end ball joint dust cover damaged or deteriorated, but preventing the ingress of dirt (2.1.3 (g) (i))	62
Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))	62
Nearside Headlamp not working on dipped beam (4.1.1 (a) (ii))	56

All 25 defects ranked by recorded countShowing 2,849 defects across this top 25 set

Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))

322

Rear Brakes imbalanced across an axle Axle 2 (1.2.1 (b) (i))

248

Windscreen washer not working (3.5 (a))

210

Horn not working (7.7 (a))

203

Parking brake efficiency below requirements (1.4.2 (a) (i))

165

Stop lamp(s) all not working (4.3.1 (a) (iii))

152

Exhaust emissions hydrocarbon content excessive (8.2.1.2 (b))

144

Windscreen washer provides insufficient washer liquid (3.5 (a))

135

Nearside Front Position lamp not working (4.2.1 (a) (ii))

119

Offside Front Position lamp not working (4.2.1 (a) (ii))

103

Offside Rear Service brake excessively binding (1.2.1 (f))

100

Nearside Rear Service brake excessively binding (1.2.1 (f))

Nearside Headlamp aim too low (4.1.2 (a))

Nearside Steering rack gaiter missing or no longer prevents the ingress of dirt (2.1.3 (g) (ii))

Offside Steering rack gaiter missing or no longer prevents the ingress of dirt (2.1.3 (g) (ii))

Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))

All direction indicators not working (4.4.1 (a) (ii))

Nearside Rear Position lamp not working (4.2.1 (a) (ii))

Offside Headlamp aim too low (4.1.2 (a))

Offside Rear Position lamp not working (4.2.1 (a) (ii))

Nearside Steering rack gaiter damaged or deteriorated, but preventing the ingress of dirt (2.1.3 (g) (i))

Parking (secondary brake) on a single line braking system imbalanced across an axle Axle 1 (1.3.1 (b) (i))

Offside Front Track rod end ball joint dust cover damaged or deteriorated, but preventing the ingress of dirt (2.1.3 (g) (i))

Parking brake efficiency less than 50% of the required value (1.4.2 (a) (ii))

Nearside Headlamp not working on dipped beam (4.1.1 (a) (ii))

MG B reliability and MOT data