1977 Triumph Stag Auto — MOT History by Age

How cars manufactured in 1977 perform at MOT as they age

49 years

Current Age

80.7%

Latest Pass Rate

2,026

Total Tests (All Years)

51,978 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 1977 Triumph Stag Auto as it ages.

32 yrs68.2%

→ ↑3.6%

33 yrs71.8%

→ ↓6.5%

34 yrs65.3%

→ ↓2.3%

35 yrs63.0%

→ ↑3.7%

36 yrs66.7%

→ ↑6.4%

37 yrs73.1%

→ ↓4.6%

38 yrs68.5%

→ ↑5.4%

39 yrs73.9%

→ ↑2.4%

40 yrs76.3%

→ ↓0.7%

41 yrs75.6%

→ ↓13.9%

42 yrs61.7%

→ ↑25.8%

43 yrs87.5%

→ ↓18.4%

44 yrs69.1%

→ ↑5.9%

45 yrs75.0%

→ ↑3.7%

46 yrs78.7%

→ ↑2.0%

47 yrs80.7%

📊 View as table

Age	Pass Rate	Tests
32 yrs	68.2%	195
33 yrs	71.8%	174
34 yrs	65.3%	196
35 yrs	63.0%	181
36 yrs	66.7%	180
37 yrs	73.1%	182
38 yrs	68.5%	197
39 yrs	73.9%	176
40 yrs	76.3%	177
41 yrs	75.6%	82
42 yrs	61.7%	47
43 yrs	87.5%	32
44 yrs	69.1%	55
45 yrs	75.0%	48
46 yrs	78.7%	47
47 yrs	80.7%	57

Pass Rate Trend

How the 1977 Triumph Stag Auto pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2024 (47 yrs)	80.7%	57
2023 (46 yrs)	78.7%	47
2022 (45 yrs)	75%	48
2021 (44 yrs)	69.1%	55
2020 (43 yrs)	87.5%	32
2019 (42 yrs)	61.7%	47
2018 (41 yrs)	75.6%	82
2017 (40 yrs)	76.3%	177
2016 (39 yrs)	73.9%	176
2015 (38 yrs)	68.5%	197
2014 (37 yrs)	73.1%	182
2013 (36 yrs)	66.7%	180
2012 (35 yrs)	63%	181
2011 (34 yrs)	65.3%	196
2010 (33 yrs)	71.8%	174
2009 (32 yrs)	68.2%	195

Year-by-Year MOT Results

2009

68.2%

Age (yrs) 32Tests 195Avg Mileage 59,117Top Failure Lamps, Reflectors and Electrical Equipment — 19.0%

2010

71.8%

Age (yrs) 33Tests 174Avg Mileage 58,568Top Failure Brakes — 13.8%

2011

65.3%

Age (yrs) 34Tests 196Avg Mileage 57,984Top Failure Lamps, Reflectors and Electrical Equipment — 22.4%

2012High Fail Rate

63.0%

Age (yrs) 35Tests 181Avg Mileage 59,536Top Failure Suspension — 19.9%

2013

66.7%

Age (yrs) 36Tests 180Avg Mileage 56,469Top Failure Suspension — 51.1%

2014

73.1%

Age (yrs) 37Tests 182Avg Mileage 58,759Top Failure Lamps, Reflectors and Electrical Equipment — 45.6%

2015

68.5%

Age (yrs) 38Tests 197Avg Mileage 54,247Top Failure Lamps, Reflectors and Electrical Equipment — 43.7%

2016

73.9%

Age (yrs) 39Tests 176Avg Mileage 55,666Top Failure Lamps, Reflectors and Electrical Equipment — 33.5%

2017

76.3%

Age (yrs) 40Tests 177Avg Mileage 56,997Top Failure Lamps, Reflectors and Electrical Equipment — 23.2%

2018

75.6%

Age (yrs) 41Tests 82Avg Mileage 52,834Top Failure Suspension — 22.0%

2019High Fail Rate

61.7%

Age (yrs) 42Tests 47Avg Mileage 52,201Top Failure Suspension — 70.2%

2020

87.5%

Age (yrs) 43Tests 32Avg Mileage 59,289Top Failure Suspension — 28.1%

2021

69.1%

Age (yrs) 44Tests 55Avg Mileage 49,617Top Failure Lamps, reflectors and electrical equipment — 38.2%

2022

75.0%

Age (yrs) 45Tests 48Avg Mileage 48,676Top Failure Suspension — 35.4%

2023

78.7%

Age (yrs) 46Tests 47Avg Mileage 55,086Top Failure Suspension — 46.8%

2024

80.7%

Age (yrs) 47Tests 57Avg Mileage 51,978Top Failure Brakes — 10.5%

MOT results for 1977 Triumph Stag Auto by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	32	68.2%	195	59,117	Lamps, Reflectors and Electrical Equipment — 19.0%
2010	33	71.8%	174	58,568	Brakes — 13.8%
2011	34	65.3%	196	57,984	Lamps, Reflectors and Electrical Equipment — 22.4%
2012	35	63.0%	181	59,536	Suspension — 19.9%
2013	36	66.7%	180	56,469	Suspension — 51.1%
2014	37	73.1%	182	58,759	Lamps, Reflectors and Electrical Equipment — 45.6%
2015	38	68.5%	197	54,247	Lamps, Reflectors and Electrical Equipment — 43.7%
2016	39	73.9%	176	55,666	Lamps, Reflectors and Electrical Equipment — 33.5%
2017	40	76.3%	177	56,997	Lamps, Reflectors and Electrical Equipment — 23.2%
2018	41	75.6%	82	52,834	Suspension — 22.0%
2019	42	61.7%	47	52,201	Suspension — 70.2%
2020	43	87.5%	32	59,289	Suspension — 28.1%
2021	44	69.1%	55	49,617	Lamps, reflectors and electrical equipment — 38.2%
2022	45	75.0%	48	48,676	Suspension — 35.4%
2023	46	78.7%	47	55,086	Suspension — 46.8%
2024	47	80.7%	57	51,978	Brakes — 10.5%

Common MOT Failures

Top failure categories across all test years for 1977 Triumph Stag Auto, with age trends.

Suspension

29.8%

↓ Decreases with age

Lamps, reflectors and electrical equipment

26.9%

↓ Decreases with age

Lamps, Reflectors and Electrical Equipment

26.6%

↓ Decreases with age

Brakes

22.0%

— Consistent

Noise, emissions and leaks

16.0%

↑ Increases with age

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Suspension	14.4% (32 yrs)	3.5% (47 yrs)	-10.9%	🟢 ↓
Brakes	12.8% (32 yrs)	10.5% (47 yrs)	-2.3%	🟢 ↓

Other Manufacture Years

1971 1972 1973 1974 1975 1976 1977 1978

← Back to Triumph Stag Auto overview

Looking for the best year to buy? See the full comparison on the Triumph Stag Auto page →

About This Data

This page shows how Triumph Stag Auto cars manufactured in 1977 perform at MOT as they age. Data spans from 2009 to 2024, covering 2,026 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.