MOT History from tests of petrol MG Bs year 1977

Review the list of common MG B failures below or to perform a specific mot history check on your MG then use our popular KnowYourCar service

mot history

Pass percent:64.62%

(The average a petrol MG B year 1977 passes without issue)

Based on:7,978 MOT Tests

Most common failures	No# failures
Exhaust emissions carbon monoxide content excessive \|7.3.B.1a\|	577
Headlamp aim out of alignment	524
Exhaust emissions hydrocarbon content excessive \|7.3.B.1b\|	277
Registration plate lamp issues	272
Windscreen wiper does not clear the windscreen effectively	235
Rear brake binding	216
Brakes imbalanced across an axle	198
Parking brake: efficiency below requirements \|3.7.B.7\|	183
Horn not working \|1.6.2a\|	150
Rear parking brake recording little or no effort	144
Offside Rear Suspension spring mounting prescribed area is excessively corroded \|2.4.A.3\|	108
Offside Stop lamp not working \|1.2.1b\|	93
Rear brake application uneven	91
Nearside Stop lamp not working \|1.2.1b\|	91
Brake pipe excessively corroded	88
Registration plate issues	84
Nearside Steering rack gaiter split \|2.2.D.2d\|	84
Nearside Rear Suspension spring mounting prescribed area is excessively corroded \|2.4.A.3\|	78
Parking brake lever has no reserve travel \|3.1.6b\|	77
Offside Steering rack gaiter split \|2.2.D.2d\|	73
Nearside Front position lamp\|s\| not working \|1.1.A.3b\|	72
Offside Front position lamp\|s\| not working \|1.1.A.3b\|	69
Nearside Headlamp not working on main beam \|1.7.5a\|	62
Service brake: efficiency below requirements \|3.7.B.7\|	59
Direction indicators not working \|1.4.A.2c\|	58
Hazard warning switch faulty \|1.4.B.1d\|	58
Fuel system component leaking \|7.2.3\|	58
Nearside Headlamp not working on dipped beam \|1.7.5a\|	54
Offside Rear Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	52
Brake hose excessively deteriorated	51
Direction indicators flashing less than 60 times a minute \|1.4.A.2g\|	50
Offside Headlamp not working on main beam \|1.7.5a\|	46
Hazard warning lamps not flashing in phase, with ignition on \|1.4.B.1f\|	46
Offside Headlamp not working on dipped beam \|1.7.5a\|	45
Exhaust emissions carbon monoxide content excessive (8.2.1.2 (b))	43
Hazard warning lamps not flashing in phase, with ignition off \|1.4.B.1f\|	43
Hazard warning lamps inoperative \|1.4.B.1b\|	39
Nearside Front Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	39
Nearside front brake binding \|3.7.B.1\|	38
Nearside Rear Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	38
All position lamps not working \|1.1.A.3b\|	38
Offside Front Steering rack gaiter split \|2.2.D.2d\|	36
Nearside rear brake recording little or no effort \|3.7.B.5a\|	36
Nearside Front Direction indicator not working \|1.4.A.2c\|	34
Battery insecure \|1.9.1\|	33
Offside Front Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	33
Offside Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	32
Nearside Front Steering rack gaiter split \|2.2.D.2d\|	32
Offside Rear position lamp\|s\| not working \|1.1.A.3b\|	31
Nearside Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	30
Nearside Rear Stop lamp not working \|1.2.1b\|	30
Exhaust has a major leak of exhaust gases \|7.1.2\|	30
Emissions not tested \|7.0\|	29
Offside Front Direction indicator not working \|1.4.A.2c\|	29
Offside Rear Stop lamp not working \|1.2.1b\|	29
Nearside Rear Shock absorber has a serious fluid leak \|2.7.3\|	28
Front brake application uneven	28
Driver`s seat insecure \|6.2.A.1\|	27
Rear Exhaust system not adequately supported \|7.1.1\|	27
Centre Exhaust system not adequately supported \|7.1.1\|	27
Offside rear brake recording little or no effort \|3.7.B.5a\|	27
Offside Rear Shock absorber has a serious fluid leak \|2.7.3\|	26
Exhaust system not adequately supported \|7.1.1\|	26
Nearside Front Headlamp not working on dipped beam \|1.7.5a\|	26
Nearside Rear position lamp\|s\| not working \|1.1.A.3b\|	26
Offside front brake binding \|3.7.B.1\|	25
Nearside Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	25
Hazard warning tell tale not working correctly \|1.4.B.1e\|	24
Windscreen washer not working	23
Front Exhaust has a major leak of exhaust gases \|7.1.2\|	22
Rear Exhaust has a major leak of exhaust gases \|7.1.2\|	21
Rear Mechanical brake component has restricted free movement	21
Nearside Rear Direction indicator not working \|1.4.A.2c\|	21
Stop lamp not working \|1.2.1b\|	21
Offside Front Shock absorber has a serious fluid leak \|2.7.3\|	20
Offside Front Headlamp not working on dipped beam \|1.7.5a\|	20
Offside Front Front position lamp\|s\| not working \|1.1.A.3b\|	20
Nearside Front Front position lamp\|s\| not working \|1.1.A.3b\|	19
Offside Rear rear brake recording little or no effort \|3.7.B.5a\|	19
Offside Front Axle king pin has excessive play in pin and/or bush adversely affecting the steering \|2.5.A.3a\|	19
Exhaust engine idle speed too high \|7.3.A.2a\|	18
Nearside Front Shock absorber has a serious fluid leak \|2.7.3\|	18
Offside Front wheel bearing has excessive play \|2.5.A.3c\|	18
Exhaust emissions carbon monoxide content excessive \|8.2.1.2 \|b\|\|	18
Nearside Rear rear brake recording little or no effort \|3.7.B.5a\|	17
Direction indicators flashing more than 120 times a minute \|1.4.A.2g\|	16
Parking brake: efficiency below requirements \|3.7.C.1b\|	16
Fuel hose leaking \|7.2.3\|	16
Stop lamp remains on when the brakes are released	16
Nearside Front Axle king pin has excessive play in pin and/or bush adversely affecting the steering \|2.5.A.3a\|	16
Windscreen has damage	15
Offside Rear Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	15
Nearside Front Headlamp not working on main beam \|1.7.5a\|	15
Offside Front Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	15
Offside Front Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	14
Nearside Front Shock absorber has negligible damping effect \|2.7.5\|	14
Steering system has excessive free play detected at the steering wheel \|steering rack fitted\| \|2.2.A.1b\|	14
Offside Rear wheel bearing has excessive play \|2.6.2\|	14
Offside Rear Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	14
Offside Rear Direction indicator not working \|1.4.A.2c\|	14
Offside Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	14
Nearside Front Vehicle structure has excessive corrosion which adversely affects braking or steering \|6.1.A.1\|	14
Exhaust emissions hydrocarbon content excessive (8.2.1.2 (b))	14
Nearside Front wheel bearing rough when rotated \|2.5.A.2\|	14
Nearside Rear Braking system leaking \|3.6.A.1\|	14
Steering wheel retaining device insecure \|2.1.6\|	13
Fuel pipe leaking \|7.2.3\|	13
Offside Front wheel bearing rough when rotated \|2.5.A.2\|	13
Offside Headlamp aim beam image obviously incorrect \|1.8.A.1b\|	12
Offside Track rod end ball joint dust cover excessively deteriorated so that it no longer prevents the ingress of dirt \|2.2.C.1c\|	12
Nearside Front wheel bearing has excessive play \|2.5.A.3c\|	12
Mechanical brake component has restricted free movement	12
Rear Stop lamp not working \|1.2.1b\|	12
Brake performance not tested \|3.7.A.1\|	12
Offside Rear Brake pipe inadequately clipped \|3.6.B.1\|	11
Driver`s seat fore and aft adjustment mechanism not functioning as intended. \|6.2.A.3\|	11
Offside Rear Wheel insecure \|4.2.A.1c\|	11
Brake master cylinder/servo mounting prescribed area is excessively corroded \|3.6.C.3\|	11
Offside Front Track rod end ball joint has excessive play \|2.2.B.1f\|	11
Nearside Rear wheel bearing has excessive play \|2.6.2\|	11
Offside Front Headlamp not working on main beam \|1.7.5a\|	11
Offside Rear Braking system leaking \|3.6.A.1\|	11
Position lamp switch faulty \|1.1.A.1\|	11
Nearside Front Direction indicators not working \|1.4.A.2c\|	11
Offside Seat belt retracting mechanism defective \|5.2.5b\|	11
Offside Front Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	11
Offside Front Seat belt retracting mechanism defective \|5.2.5b\|	11
Nearside Front Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	11
Nearside Front Seat belt insecurely fixed to the vehicles structure \|5.2.1a\|	10
Nearside Rear Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	10
Offside Front Shock absorber has negligible damping effect \|2.7.5\|	10
Front Windscreen wiper not operating automatically when switched on \|8.2.1b\|	10
Offside Track rod end ball joint has excessive play \|2.2.B.1f\|	10
Nearside Front Vehicle structure has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	10
Nearside Rear Body or chassis has excessive corrosion, seriously affecting its strength within 30cm of the body mountings \|6.1.B.2\|	10
Nearside Suspension component mounting prescribed area is excessively corroded \|2.4.A.3\|	10
Offside Rear Rear position lamp\|s\| excessively deteriorated so that it is not visible from a reasonable distance \|1.1.A.3d\|	10
An item not tested \|Manual\|	10
Front Exhaust system not adequately supported \|7.1.1\|	10
Main beam `tell-tale` not working \|1.7.4c\|	9
Nearside Track rod end ball joint has excessive play \|2.2.B.1f\|	9
Offside Front front brake binding \|3.7.B.1\|	9
Offside Front Vehicle structure has excessive corrosion which adversely affects braking or steering \|6.1.A.1\|	9
Offside Front Seat belt locking mechanism does not secure or release \|5.2.5a\|	9
Nearside Rear Seat belt anchorage prescribed area is excessively corroded \|5.2.6\|	9
Offside Front Brake master cylinder/servo mounting prescribed area is excessively corroded \|3.6.C.3\|	9
Offside Rear Anti-roll bar rubber bush deteriorated resulting in excessive movement \|2.4.G.2\|	9
Centre Exhaust has a major leak of exhaust gases \|7.1.2\|	9
Front passenger door cannot be opened from inside the vehicle \|6.2.B.1b\|	9
Offside Front Direction indicators not working \|1.4.A.2c\|	9
Nearside Rear Direction indicators not working \|1.4.A.2c\|	9
Headlamp switch faulty \|1.7.1\|	9
Brake hydraulic reservoir fluid level below minimum level \|3.6.G.1b\|	9
Nearside Front Subframe mounting prescribed area is excessively corroded \|2.4.A.3\|	9

We get to these numbers by trawling through over 1 billion MOT test results since 2004 and crunched the numbers. We remove anything to do with Tyres, as they are model independent and group together common non-model specific issues. We are trying to get to a picture of what models have what issues.

Please note: We take the data from the DVSA. This data is raw and can contain typos and spelling mistakes that garages may have entered while recording a MOT result. Specifically miss-match on names of models and makes. We are constantly cleaning the data so bear with the odd issue.

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MOT History from tests of petrol MG Bs year 1977

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