MG B GT: MOT pass rate and reliability data

The MG B GT passes its MOT first time more often than the average UK car, by 5.4 percentage points. These figures come from the DVSA's full year of anonymised MOT results, covering 1,275 individual MG B GT tests. Nothing here is an estimate or a survey.

The numbers

First-time pass rate82.1%
UK national average76.7%
Difference+5.4 points
Tests analysed1,275
Average mileage at test45,624 miles
Average year of manufacture1975
Reliability rank1,376 of 2,005 models

What this means if you are buying one

A 82.1% first-time pass rate means roughly 18 in every 100 MG B GTs presented for MOT fail on the first attempt. That is better than average, so a well-kept example is a reasonably safe used buy. The average MG B GT tested had covered 45,624 miles and was built around 1975.

What this means at salvage auction

Pass rate is a proxy for what a car costs to keep on the road. The MG B GT sits 5.4 points above the national average, ranked 1,376 of 2,005 models. On one bought as repairable salvage, the mechanical side is less likely to spring surprises, so your repair estimate should hold up reasonably well.

Before you bid: run the lot through the analyzer, check the car's own record, check the mileage, decode the VIN, and if it carries a marker use the write-off value calculator. Or compare it against another model.

Looking at a specific MG B GT rather than the model in general? The free check covers its MOT and mileage history, and the full HPI report confirms the insurance write-off category, outstanding finance and whether it is recorded stolen, from licensed data for 5 credits. Already own one that has been damaged? Work out whether fixing it beats selling it with the repair or scrap calculator, and see recorded closing bids for damaged MG B GTs at UK salvage auction.

Most common MOT failures on a MG B GT

  1. Emissions levels exceed default limits, 3.6% of tests (10.19x the national rate for this defect)
  2. Brakes imbalance across an axle such that the braking effort from any wheel is less than 70% of the maximum effort recorded from the other wheel on the same axle., 2.8% of tests (5.4x the national rate for this defect)
  3. Audible warning inoperative, 1.3% of tests (4.45x the national rate for this defect)
  4. Steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, 3.2% of tests (4.32x the national rate for this defect)
  5. A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 1.7% of tests (2.63x the national rate for this defect)
  6. A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED, 2.7% of tests (2.24x the national rate for this defect)
  7. Significant brake effort recorded with no brake applied indicating a binding brake, 2% of tests (1.89x the national rate for this defect)
  8. Windscreen washers not working or not providing sufficient fluid to clear the windscreen, 3% of tests (1.77x the national rate for this defect)
  9. The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, 1.3% of tests (1.33x the national rate for this defect)
  10. The aim of a headlamp is not within limits laid down in the requirements, 2.9% of tests (1.23x the national rate for this defect)

From 1,276 DVSA-tracked MG B GT tests, 2024. DVSA testers marked 3.69% of these flagged MG B GT defects as "dangerous", meaning the tester judged the car unsafe to drive away, against 5.11% nationally.

Most common MOT advisories on a MG B GT

An advisory doesn't fail the car - the tester flags it as worth watching, but it still passes. A different list from the failures above: what testers are noting on a MG B GT before it actually fails on it.

  1. A wheel bearing with excessive play, 6.3% of tests (9.66x the national rate for this advisory)
  2. A wheel bearing excessively rough, 2% of tests (5.26x the national rate for this advisory)
  3. Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users, 14.9% of tests (2.68x the national rate for this advisory)
  4. Significant brake effort recorded with no brake applied indicating a binding brake, 3% of tests (1.49x the national rate for this advisory), also fails
  5. Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 1.6% of tests (1.26x the national rate for this advisory)
  6. A suspension pin, bush or joint excessively worn, 8.9% of tests
  7. A tyre seriously damaged, 4.5% of tests
  8. Brake pipe damaged or excessively corroded, 2.6% of tests
  9. Tyre tread depth not in accordance with the requirements, 2.4% of tests
  10. A shock absorber damaged to the extent that it does not function or showing signs of severe leakage, 2% of tests

From 1,276 DVSA-tracked MG B GT tests, 2024.

Other MG models

Models with a similar pass rate

If this car is a salvage or write-off

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MG B GT MOT pass rate badge: 82.1%

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MG B GT most common MOT failure: Emissions levels exceed default limits (3.6% of tests)

<a href="https://www.salvageprophet.co.uk/mot/mg-b-gt"><img src="https://www.salvageprophet.co.uk/badge/failure/mg-b-gt.svg" width="340" height="106" alt="MG B GT most common MOT failure: Emissions levels exceed default limits (3.6% of tests) - Salvage Prophet"></a>

All 2,005 models ranked by MOT pass rate