1971 Triumph Stag Auto — MOT History by Age

How cars manufactured in 1971 perform at MOT as they age

55 years

Current Age

85.7%

Latest Pass Rate

2,093

Total Tests (All Years)

49,296 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 1971 Triumph Stag Auto as it ages.

38 yrs69.5%

→ ↓2.1%

39 yrs67.4%

→ ↑3.1%

40 yrs70.5%

→ ↓0.9%

41 yrs69.6%

→ ↑2.5%

42 yrs72.1%

→ ↑0.4%

43 yrs72.5%

→ ↓1.4%

44 yrs71.1%

→ ↑3.2%

45 yrs74.3%

→ ↑1.3%

46 yrs75.6%

→ ↑7.0%

47 yrs82.6%

→ ↓12.4%

48 yrs70.2%

→ ↑15.5%

49 yrs85.7%

📊 View as table

Age	Pass Rate	Tests
38 yrs	69.5%	220
39 yrs	67.4%	215
40 yrs	70.5%	207
41 yrs	69.6%	204
42 yrs	72.1%	204
43 yrs	72.5%	218
44 yrs	71.1%	218
45 yrs	74.3%	202
46 yrs	75.6%	213
47 yrs	82.6%	86
48 yrs	70.2%	57
49 yrs	85.7%	49

Pass Rate Trend

How the 1971 Triumph Stag Auto pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (49 yrs)	85.7%	49
2019 (48 yrs)	70.2%	57
2018 (47 yrs)	82.6%	86
2017 (46 yrs)	75.6%	213
2016 (45 yrs)	74.3%	202
2015 (44 yrs)	71.1%	218
2014 (43 yrs)	72.5%	218
2013 (42 yrs)	72.1%	204
2012 (41 yrs)	69.6%	204
2011 (40 yrs)	70.5%	207
2010 (39 yrs)	67.4%	215
2009 (38 yrs)	69.5%	220

Year-by-Year MOT Results

2009

69.5%

Age (yrs) 38Tests 220Avg Mileage 52,818Top Failure Lamps, Reflectors and Electrical Equipment — 21.4%

2010

67.4%

Age (yrs) 39Tests 215Avg Mileage 54,565Top Failure Suspension — 22.3%

2011

70.5%

Age (yrs) 40Tests 207Avg Mileage 54,008Top Failure Lamps, Reflectors and Electrical Equipment — 15.9%

2012

69.6%

Age (yrs) 41Tests 204Avg Mileage 51,385Top Failure Suspension — 17.2%

2013

72.1%

Age (yrs) 42Tests 204Avg Mileage 52,355Top Failure Lamps, Reflectors and Electrical Equipment — 38.7%

2014

72.5%

Age (yrs) 43Tests 218Avg Mileage 49,155Top Failure Lamps, Reflectors and Electrical Equipment — 46.8%

2015

71.1%

Age (yrs) 44Tests 218Avg Mileage 51,018Top Failure Lamps, Reflectors and Electrical Equipment — 40.8%

2016

74.3%

Age (yrs) 45Tests 202Avg Mileage 52,636Top Failure Lamps, Reflectors and Electrical Equipment — 28.7%

2017

75.6%

Age (yrs) 46Tests 213Avg Mileage 52,092Top Failure Suspension — 30.0%

2018

82.6%

Age (yrs) 47Tests 86Avg Mileage 52,312Top Failure Lamps, Reflectors and Electrical Equipment — 11.6%

2019

70.2%

Age (yrs) 48Tests 57Avg Mileage 49,820Top Failure Lamps, reflectors and electrical equipment — 43.9%

2020

85.7%

Age (yrs) 49Tests 49Avg Mileage 49,296Top Failure Suspension — 24.5%

MOT results for 1971 Triumph Stag Auto by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	38	69.5%	220	52,818	Lamps, Reflectors and Electrical Equipment — 21.4%
2010	39	67.4%	215	54,565	Suspension — 22.3%
2011	40	70.5%	207	54,008	Lamps, Reflectors and Electrical Equipment — 15.9%
2012	41	69.6%	204	51,385	Suspension — 17.2%
2013	42	72.1%	204	52,355	Lamps, Reflectors and Electrical Equipment — 38.7%
2014	43	72.5%	218	49,155	Lamps, Reflectors and Electrical Equipment — 46.8%
2015	44	71.1%	218	51,018	Lamps, Reflectors and Electrical Equipment — 40.8%
2016	45	74.3%	202	52,636	Lamps, Reflectors and Electrical Equipment — 28.7%
2017	46	75.6%	213	52,092	Suspension — 30.0%
2018	47	82.6%	86	52,312	Lamps, Reflectors and Electrical Equipment — 11.6%
2019	48	70.2%	57	49,820	Lamps, reflectors and electrical equipment — 43.9%
2020	49	85.7%	49	49,296	Suspension — 24.5%

Common MOT Failures

Top failure categories across all test years for 1971 Triumph Stag Auto, with age trends.

Lamps, reflectors and electrical equipment

43.9%

— Consistent

Lamps, Reflectors and Electrical Equipment

25.8%

↓ Decreases with age

Suspension

23.7%

↑ Increases with age

Brakes

19.1%

↑ Increases with age

Body, Structure and General Items

17.9%

— Consistent

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Suspension	12.3% (38 yrs)	24.5% (49 yrs)	+12.2%	🔴 ↑
Brakes	14.5% (38 yrs)	24.5% (49 yrs)	+10.0%	🔴 ↑
Steering	9.5% (38 yrs)	10.2% (49 yrs)	+0.7%	⚪ —

Other Manufacture Years

1971 1972 1973 1974 1975 1976 1977 1978

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About This Data

This page shows how Triumph Stag Auto cars manufactured in 1971 perform at MOT as they age. Data spans from 2009 to 2020, covering 2,093 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.