What year Porsche 928 S is most reliable?

Based on MOT first-test pass rates, the 1991 Porsche 928 S has the highest pass rate at 79.3%, out of 134 vehicles tested.

What are the most common Porsche 928 S MOT failures?

The most common Porsche 928 S MOT failures vary by year. Check the individual year pages for detailed defect breakdowns — links in the table above.

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Porsche 928 S — Reliability by Year

2,245 vehicles · MOT data 1980–1991 · first-test pass rates

This page shows MOT first-test pass rates for each year the Porsche 928 S was manufactured — click any year to explore that cohort in detail. Trying to decide which year to buy? See the full buying guide →

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Best pass rate year

1991

79.3% pass rate · 134 vehicles

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Lowest pass rate year

1982

71.3% pass rate · 148 vehicles

Year	Pass rate	Avg mileage	Vehicles
1991	79.3%	112,662 mi	134
1990	77.2%	112,714 mi	149
1989	76.7%	110,672 mi	210
1988	78.9%	111,612 mi	273
1987	75.8%	117,127 mi	207
1986	75.2%	115,502 mi	265
1985	73.8%	102,449 mi	193
1984	74.9%	104,772 mi	225
1983	72.5%	95,558 mi	197
1982	71.3%	101,007 mi	148
1981	78.8%	96,301 mi	107
1980	75.1%	88,208 mi	137

Which year Porsche 928 S is most reliable?

MOT pass rate by year of manufacture — averaged across each vehicle's lifetime of tests. Green = noticeably above average for this model; red = noticeably below average.

Tests range from an average of 88,208 miles (newest year) to 117,127 miles (oldest year). Older years naturally accumulate more tests at higher mileages — see the mileage-normalised breakdown →

Trying to decide which year to buy?

We've done the full analysis — which years to look for, which to avoid, and where to find the best value for reliability on a Porsche 928 S.

See the buying guide →

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