1978 Triumph Tr 7 MOT Pass Rate
Pass rate for Tr 7 models manufactured in 1978, based on 384 real MOT test results.
Data from official DVSA MOT testing records
This page shows all Tr 7 cars tested in 1978. Want to see how cars built in 1978 hold up over time?
View 1978 Triumph Tr 7 vintage page → (78.1% current pass rate)1978 Triumph Tr 7 MOT Analysis
The 1978 Triumph Tr 7 has an MOT pass rate of 67.7% based on 384 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 50,241 miles on the odometer. With a 32.3% failure rate, the 1978 Tr 7 is rated as "Good" for MOT reliability.
The leading cause of MOT failure for the 1978 Triumph Tr 7 is Noise, emissions and leaks, responsible for 0.5% 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+. Steering is the second most common issue at 0.5%. Visibility follows at 0.3%.
Top failures specific to 1978 models only. The overall Tr 7 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 | 0.5% | 2 |
| 2 | Steering | 0.5% | 2 |
| 3 | Visibility | 0.3% | 1 |
| 4 | Body, Chassis, Structure | 0.3% | 1 |
| 5 | Lamps, Reflectors And Electrical Equipment | 0.3% | 1 |
Failures per 10,000 Miles
avg. 50,241 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.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Noise, emissions and leaks | 0.10 | 0.5% | 2 |
| Steering | 0.10 | 0.5% | 2 |
| Visibility | 0.05 | 0.3% | 1 |
| Body & Structure | 0.05 | 0.3% | 1 |
| Lamps & Electrical | 0.05 | 0.3% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1978 Triumph Tr 7 has an MOT pass rate of 67.7% based on 384 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 50,241 miles on the odometer. With a 32.3% failure rate, the 1978 Tr 7 is rated as "Good" for MOT reliability.
If you own or are considering buying a 1978 Triumph Tr 7, you can expect reliable MOT performance overall. 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. At 50,241 average miles, these vehicles are in the mid-range where component wear starts to become a factor.
Noise, emissions and leaks — 0.5% of failures
Noise, emissions and leaks issues account for 0.5% of MOT failures on 1978 Triumph Tr 7 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.
Steering — 0.5% of failures
Steering issues account for 0.5% of MOT failures on 1978 Triumph Tr 7 models. Steering failures include excessive play in the steering wheel, leaking power steering fluid, worn track rod ends, and damaged steering rack. These affect vehicle control and are closely related to suspension wear. Typical repair costs: £150–600. Pre-MOT check: Check for excessive steering wheel play (more than a few inches of free movement). Listen for whining from the power steering pump. Look for fluid leaks under the car near the front wheels.
Visibility — 0.3% of failures
Visibility issues account for 0.3% of MOT failures on 1978 Triumph Tr 7 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.