1977 MG Mgbgt MOT Pass Rate
Pass rate for Mgbgt models manufactured in 1977, based on 60 real MOT test results.
Data from official DVSA MOT testing records
1977 MG Mgbgt MOT Analysis
The 1977 MG Mgbgt has an MOT pass rate of 63.3% based on 60 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 37,329 miles on the odometer. With a 36.7% failure rate, the 1977 Mgbgt is rated as "Average" for MOT reliability.
The leading cause of MOT failure for the 1977 MG Mgbgt is Noise, emissions and leaks, responsible for 3.3% of failures. Emissions failures occur when exhaust gases exceed legal limits for carbon monoxide (CO), hydrocarbons (HC), or particulate matter (diesel). Common causes include faulty oxygen sensors, clogged catalytic converters, or DPF issues on diesel vehicles. Typical repair costs range from £100–1,000+. Visibility is the second most common issue at 1.7%. Body, chassis, structure follows at 1.7%.
Top failures specific to 1977 models only. The overall Mgbgt page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Noise, Emissions And Leaks | 3.3% | 2 |
| 2 | Visibility | 1.7% | 1 |
| 3 | Body, Chassis, Structure | 1.7% | 1 |
| 4 | Brakes | 1.7% | 1 |
| 5 | Non-component Advisories | 1.7% | 1 |
| 6 | Tyres | 1.7% | 1 |
Failures per 10,000 Miles
avg. 37,329 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
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| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Noise, emissions and leaks | 0.89 | 3.3% | 2 |
| Visibility | 0.45 | 1.7% | 1 |
| Body & Structure | 0.45 | 1.7% | 1 |
| Brakes | 0.45 | 1.7% | 1 |
| Non-component advisories | 0.45 | 1.7% | 1 |
| Tyres | 0.45 | 1.7% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1977 MG Mgbgt has an MOT pass rate of 63.3% based on 60 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 37,329 miles on the odometer. With a 36.7% failure rate, the 1977 Mgbgt is rated as "Average" for MOT reliability.
If you own or are considering buying a 1977 MG Mgbgt, budget for potential repairs before each MOT. Before your MOT, pay particular attention to noise, emissions and leaks: If the engine management light is on, get it diagnosed before the MOT. For diesel cars, ensure the DPF has completed a regeneration cycle. Regular servicing and using premium fuel before the test can help. With relatively low average mileage of 37,329 miles, many of these vehicles are still in good mechanical condition.
Noise, emissions and leaks — 3.3% of failures
Noise, emissions and leaks issues account for 3.3% of MOT failures on 1977 MG Mgbgt models. Emissions failures occur when exhaust gases exceed legal limits for carbon monoxide (CO), hydrocarbons (HC), or particulate matter (diesel). Common causes include faulty oxygen sensors, clogged catalytic converters, or DPF issues on diesel vehicles. Typical repair costs: £100–1,000+. Pre-MOT check: If the engine management light is on, get it diagnosed before the MOT. For diesel cars, ensure the DPF has completed a regeneration cycle. Regular servicing and using premium fuel before the test can help.
Visibility — 1.7% of failures
Visibility issues account for 1.7% of MOT failures on 1977 MG Mgbgt models. Visibility failures relate to the windscreen, wipers, washers, mirrors, and view-obstructing damage. Cracks in the windscreen swept area, ineffective wipers, or empty washer bottles are common causes. Typical repair costs: £10–300. Pre-MOT check: Check the windscreen for chips and cracks — damage larger than 10mm in the driver's swept area or 40mm elsewhere will fail. Test washers and wipers. Ensure both door mirrors are intact and adjustable.
Body, chassis, structure — 1.7% of failures
Body, chassis, structure issues account for 1.7% of MOT failures on 1977 MG Mgbgt models. Body and structure failures include excessive corrosion, sharp edges, loose panels, and damage to the vehicle frame. Rust is the primary concern, especially on older vehicles or those exposed to road salt. Typical repair costs: £100–500+. Pre-MOT check: Inspect sills, wheel arches, door bottoms, and the chassis for rust. Surface rust is acceptable but structural corrosion or holes will fail. Check that all doors, bonnet, and boot close securely.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.