1977 Pontiac Trans Am MOT Pass Rate
Pass rate for Trans Am models manufactured in 1977, based on 48 real MOT test results.
Data from official DVSA MOT testing records
1977 Pontiac Trans Am MOT Analysis
The 1977 Pontiac Trans Am has an MOT pass rate of 79.2% based on 48 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 55,338 miles on the odometer. With a 20.8% failure rate, the 1977 Trans Am is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1977 Pontiac Trans Am is Noise, emissions and leaks, responsible for 6.3% 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+. Suspension is the second most common issue at 2.1%.
Top failures specific to 1977 models only. The overall Trans Am 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 | 6.3% | 3 |
| 2 | Suspension | 2.1% | 1 |
Failures per 10,000 Miles
avg. 55,338 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 | 1.13 | 6.3% | 3 |
| Suspension | 0.38 | 2.1% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1977 Pontiac Trans Am has an MOT pass rate of 79.2% based on 48 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 55,338 miles on the odometer. With a 20.8% failure rate, the 1977 Trans Am is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1977 Pontiac Trans Am, 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 55,338 average miles, these vehicles are in the mid-range where component wear starts to become a factor.
Noise, emissions and leaks — 6.3% of failures
Noise, emissions and leaks issues account for 6.3% of MOT failures on 1977 Pontiac Trans Am 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.
Suspension — 2.1% of failures
Suspension issues account for 2.1% of MOT failures on 1977 Pontiac Trans Am models. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.