1991 Proton 1.5 MOT Pass Rate
Pass rate for 1.5 models manufactured in 1991, based on 577 real MOT test results.
Data from official DVSA MOT testing records
This page shows all 1.5 cars tested in 1991. Want to see how cars built in 1991 hold up over time?
View 1991 Proton 1.5 vintage page → (67.6% current pass rate)1991 Proton 1.5 MOT Analysis
The 1991 Proton 1.5 has an MOT pass rate of 60.0% based on 577 tests — slightly below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 71,629 miles on the odometer. With a 40.0% failure rate, the 1991 1.5 is rated as "Below Average" for MOT reliability.
The leading cause of MOT failure for the 1991 Proton 1.5 is Brakes, responsible for 1.0% of failures. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs range from £150–400. Seat belts and supplementary restraint systems is the second most common issue at 0.7%. Noise, emissions and leaks follows at 0.3%.
Top failures specific to 1991 models only. The overall 1.5 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 | Brakes | 1.0% | 6 |
| 2 | Seat Belts And Supplementary Restraint Systems | 0.7% | 4 |
| 3 | Noise, Emissions And Leaks | 0.3% | 2 |
| 4 | Suspension | 0.3% | 2 |
| 5 | Visibility | 0.3% | 2 |
| 6 | Identification Of The Vehicle | 0.3% | 2 |
| 7 | Lamps, Reflectors And Electrical Equipment | 0.3% | 2 |
Failures per 10,000 Miles
avg. 71,629 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 |
|---|---|---|---|
| Brakes | 0.15 | 1.0% | 6 |
| Seat Belts | 0.10 | 0.7% | 4 |
| Noise, emissions and leaks | 0.05 | 0.3% | 2 |
| Suspension | 0.05 | 0.3% | 2 |
| Visibility | 0.05 | 0.3% | 2 |
| Identification of the vehicle | 0.05 | 0.3% | 2 |
| Lamps & Electrical | 0.05 | 0.3% | 2 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Proton 1.5 has an MOT pass rate of 60.0% based on 577 tests — slightly below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 71,629 miles on the odometer. With a 40.0% failure rate, the 1991 1.5 is rated as "Below Average" for MOT reliability.
If you own or are considering buying a 1991 Proton 1.5, budget for potential repairs before each MOT. Before your MOT, pay particular attention to brakes: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm). At 71,629 average miles, these vehicles are in the mid-range where component wear starts to become a factor.
Brakes — 1.0% of failures
Brakes issues account for 1.0% of MOT failures on 1991 Proton 1.5 models. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Seat belts and supplementary restraint systems — 0.7% of failures
Seat belts and supplementary restraint systems issues account for 0.7% of MOT failures on 1991 Proton 1.5 models. Seat belt failures include frayed or cut webbing, faulty retractors, buckles that don't latch properly, and missing or damaged anchorages. All fitted seat belts must be functional. Typical repair costs: £50–200 per belt. Pre-MOT check: Pull each seat belt fully out and check for fraying, cuts, or fading. Ensure each belt retracts smoothly and the buckle clicks securely. Check the pre-tensioner warning light on the dashboard.
Noise, emissions and leaks — 0.3% of failures
Noise, emissions and leaks issues account for 0.3% of MOT failures on 1991 Proton 1.5 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.