1989 Porsche 928 S Series 4 Auto MOT Pass Rate
Pass rate for 928 S Series 4 Auto models manufactured in 1989, based on 40 real MOT test results.
Data from official DVSA MOT testing records
1989 Porsche 928 S Series 4 Auto MOT Analysis
The 1989 Porsche 928 S Series 4 Auto has an MOT pass rate of 90.0% based on 40 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 79,981 miles on the odometer. With a 10.0% failure rate, the 1989 928 S Series 4 Auto is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1989 Porsche 928 S Series 4 Auto is Visibility, responsible for 2.5% of failures. 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 range from £10–300.
Top failures specific to 1989 models only. The overall 928 S Series 4 Auto 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 | Visibility | 2.5% | 1 |
Failures per 10,000 Miles
avg. 79,981 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 |
|---|---|---|---|
| Visibility | 0.31 | 2.5% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1989 Porsche 928 S Series 4 Auto has an MOT pass rate of 90.0% based on 40 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 79,981 miles on the odometer. With a 10.0% failure rate, the 1989 928 S Series 4 Auto is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1989 Porsche 928 S Series 4 Auto, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to visibility: 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. At 79,981 average miles, these vehicles are in the mid-range where component wear starts to become a factor.
Visibility — 2.5% of failures
Visibility issues account for 2.5% of MOT failures on 1989 Porsche 928 S Series 4 Auto 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.