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Model reliability
MG B reliability
The MG B fails its MOT less often than most cars over 10 years old: 21.3% of 2,732 tests failed in 2023, against 39.7% on average.
Over 10 years old
21.3% failed their MOT
From 2,732 MOT tests of MG Bs this age.
Where it does worse than other cars this age
Fails 3× as oftenElectrical equipment2% vs 0.8%
Fails 4× as oftenSteering gear1.9% vs 0.5%
Fails 3× as oftenFuel system1.1% vs 0.4%
Advised 4× as oftenWheel bearings6.2% vs 1.7%
Checking a MG B before you buy
Look at the parts above at the viewing, and read the car’s own MOT history: advisories for the same parts suggest the problem is already starting. Sweep’s free check shows every MOT, advisory and mileage reading for a registration.
Source: DVSA anonymised MOT tests 2023 (Open Government Licence v3.0). Failure rates compare this model with all cars in the same age band. Fix prices are typical independent-garage estimates.