1991 Porsche 928 — MOT History by Age

How cars manufactured in 1991 perform at MOT as they age

35 years

Current Age

76.0%

Latest Pass Rate

1,395

Total Tests (All Years)

117,585 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Insufficient data for same-age comparison.

How This Car Ages

Pass rate progression for the 1991 Porsche 928 as it ages.

18 yrs71.8%

→ ↑3.0%

19 yrs74.8%

→ ↓1.9%

20 yrs72.9%

→ ↓10.3%

21 yrs62.6%

→ ↑9.3%

22 yrs71.9%

→ ↑1.9%

23 yrs73.8%

→ ↓2.1%

24 yrs71.7%

→ ↓4.7%

25 yrs67.0%

→ ↑3.0%

26 yrs70.0%

→ ↑9.6%

27 yrs79.6%

→ ↓7.7%

28 yrs71.9%

→ ↓2.1%

29 yrs69.8%

→ ↑9.5%

30 yrs79.3%

→ ↓11.4%

31 yrs67.9%

→ ↑9.2%

32 yrs77.1%

→ ↓1.1%

33 yrs76.0%

📊 View as table

Age	Pass Rate	Tests
18 yrs	71.8%	124
19 yrs	74.8%	107
20 yrs	72.9%	107
21 yrs	62.6%	99
22 yrs	71.9%	96
23 yrs	73.8%	80
24 yrs	71.7%	99
25 yrs	67.0%	88
26 yrs	70.0%	90
27 yrs	79.6%	54
28 yrs	71.9%	57
29 yrs	69.8%	43
30 yrs	79.3%	58
31 yrs	67.9%	56
32 yrs	77.1%	70
33 yrs	76.0%	167

Pass Rate Trend

How the 1991 Porsche 928 pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2024 (33 yrs)	76%	167
2023 (32 yrs)	77.1%	70
2022 (31 yrs)	67.9%	56
2021 (30 yrs)	79.3%	58
2020 (29 yrs)	69.8%	43
2019 (28 yrs)	71.9%	57
2018 (27 yrs)	79.6%	54
2017 (26 yrs)	70%	90
2016 (25 yrs)	67%	88
2015 (24 yrs)	71.7%	99
2014 (23 yrs)	73.8%	80
2013 (22 yrs)	71.9%	96
2012 (21 yrs)	62.6%	99
2011 (20 yrs)	72.9%	107
2010 (19 yrs)	74.8%	107
2009 (18 yrs)	71.8%	124

Year-by-Year MOT Results

2009

71.8%

Age (yrs) 18Tests 124Avg Mileage 110,794Top Failure Brakes — 13.7%

2010

74.8%

Age (yrs) 19Tests 107Avg Mileage 109,026Top Failure Lamps, Reflectors and Electrical Equipment — 16.8%

2011

72.9%

Age (yrs) 20Tests 107Avg Mileage 110,708Top Failure Lamps, Reflectors and Electrical Equipment — 16.8%

2012High Fail Rate

62.6%

Age (yrs) 21Tests 99Avg Mileage 109,695Top Failure Lamps, Reflectors and Electrical Equipment — 19.2%

2013

71.9%

Age (yrs) 22Tests 96Avg Mileage 110,025Top Failure Lamps, Reflectors and Electrical Equipment — 51.0%

2014

73.8%

Age (yrs) 23Tests 80Avg Mileage 110,244Top Failure Lamps, Reflectors and Electrical Equipment — 23.8%

2015

71.7%

Age (yrs) 24Tests 99Avg Mileage 116,179Top Failure Lamps, Reflectors and Electrical Equipment — 37.4%

2016

67.0%

Age (yrs) 25Tests 88Avg Mileage 119,994Top Failure Lamps, Reflectors and Electrical Equipment — 38.6%

2017

70.0%

Age (yrs) 26Tests 90Avg Mileage 123,375Top Failure Lamps, Reflectors and Electrical Equipment — 43.3%

2018

79.6%

Age (yrs) 27Tests 54Avg Mileage 121,445Top Failure Lamps, reflectors and electrical equipment — 22.2%

2019

71.9%

Age (yrs) 28Tests 57Avg Mileage 119,029Top Failure Lamps, reflectors and electrical equipment — 52.6%

2020

69.8%

Age (yrs) 29Tests 43Avg Mileage 131,328Top Failure Lamps, reflectors and electrical equipment — 41.9%

2021

79.3%

Age (yrs) 30Tests 58Avg Mileage 126,439Top Failure Lamps, reflectors and electrical equipment — 25.9%

2022

67.9%

Age (yrs) 31Tests 56Avg Mileage 111,344Top Failure Lamps, reflectors and electrical equipment — 50.0%

2023

77.1%

Age (yrs) 32Tests 70Avg Mileage 111,945Top Failure Lamps, reflectors and electrical equipment — 37.1%

2024

76.0%

Age (yrs) 33Tests 167Avg Mileage 117,585Top Failure Lamps, reflectors and electrical equipment — 20.4%

MOT results for 1991 Porsche 928 by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	18	71.8%	124	110,794	Brakes — 13.7%
2010	19	74.8%	107	109,026	Lamps, Reflectors and Electrical Equipment — 16.8%
2011	20	72.9%	107	110,708	Lamps, Reflectors and Electrical Equipment — 16.8%
2012	21	62.6%	99	109,695	Lamps, Reflectors and Electrical Equipment — 19.2%
2013	22	71.9%	96	110,025	Lamps, Reflectors and Electrical Equipment — 51.0%
2014	23	73.8%	80	110,244	Lamps, Reflectors and Electrical Equipment — 23.8%
2015	24	71.7%	99	116,179	Lamps, Reflectors and Electrical Equipment — 37.4%
2016	25	67.0%	88	119,994	Lamps, Reflectors and Electrical Equipment — 38.6%
2017	26	70.0%	90	123,375	Lamps, Reflectors and Electrical Equipment — 43.3%
2018	27	79.6%	54	121,445	Lamps, reflectors and electrical equipment — 22.2%
2019	28	71.9%	57	119,029	Lamps, reflectors and electrical equipment — 52.6%
2020	29	69.8%	43	131,328	Lamps, reflectors and electrical equipment — 41.9%
2021	30	79.3%	58	126,439	Lamps, reflectors and electrical equipment — 25.9%
2022	31	67.9%	56	111,344	Lamps, reflectors and electrical equipment — 50.0%
2023	32	77.1%	70	111,945	Lamps, reflectors and electrical equipment — 37.1%
2024	33	76.0%	167	117,585	Lamps, reflectors and electrical equipment — 20.4%

Common MOT Failures

Top failure categories across all test years for 1991 Porsche 928, with age trends.

Lamps, reflectors and electrical equipment

35.7%

— Consistent

Lamps, Reflectors and Electrical Equipment

28.8%

↑ Increases with age

Brakes

18.4%

— Consistent

Suspension

16.1%

↑ Increases with age

Non-component advisories

12.9%

— Consistent

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Suspension	5.6% (18 yrs)	19.2% (33 yrs)	+13.6%	🔴 ↑
Brakes	13.7% (18 yrs)	15.6% (33 yrs)	+1.9%	⚪ —

Other Manufacture Years

1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995

← Back to Porsche 928 overview

Looking for the best year to buy? See the full comparison on the Porsche 928 page →

About This Data

This page shows how Porsche 928 cars manufactured in 1991 perform at MOT as they age. Data spans from 2009 to 2024, covering 1,395 tests. Pass rates naturally decline with age as components wear.

Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.