1981 Porsche Unclassified MOT Pass Rate
Pass rate for Unclassified models manufactured in 1981, based on 49 real MOT test results.
Data from official DVSA MOT testing records
1981 Porsche Unclassified MOT Analysis
The 1981 Porsche Unclassified has an MOT pass rate of 65.3% based on 49 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 128,212 miles on the odometer. With a 34.7% failure rate, the 1981 Unclassified is rated as "Good" for MOT reliability.
The leading cause of MOT failure for the 1981 Porsche Unclassified is Tyres, responsible for 30.6% of failures. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs range from £50–200 per tyre. Brakes is the second most common issue at 18.4%. Suspension follows at 12.2%.
Top failures specific to 1981 models only. The overall Unclassified 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 | Tyres | 30.6% | 15 |
| 2 | Brakes | 18.4% | 9 |
| 3 | Suspension | 12.2% | 6 |
| 4 | Visibility | 6.1% | 3 |
Failures per 10,000 Miles
avg. 128,212 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 |
|---|---|---|---|
| Tyres | 2.39 | 30.6% | 15 |
| Brakes | 1.43 | 18.4% | 9 |
| Suspension | 0.96 | 12.2% | 6 |
| Visibility | 0.48 | 6.1% | 3 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1981 Porsche Unclassified has an MOT pass rate of 65.3% based on 49 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 128,212 miles on the odometer. With a 34.7% failure rate, the 1981 Unclassified is rated as "Good" for MOT reliability.
If you own or are considering buying a 1981 Porsche Unclassified, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to tyres: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating. With an average mileage of 128,212 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Tyres — 30.6% of failures
Tyres issues account for 30.6% of MOT failures on 1981 Porsche Unclassified models. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Brakes — 18.4% of failures
Brakes issues account for 18.4% of MOT failures on 1981 Porsche Unclassified 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).
Suspension — 12.2% of failures
Suspension issues account for 12.2% of MOT failures on 1981 Porsche Unclassified 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.