1966 Triumph Tr4a — MOT History by Age

How cars manufactured in 1966 perform at MOT as they age

60 years

Current Age

89.2%

Latest Pass Rate

2,456

Total Tests (All Years)

38,310 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Best vintage for Tr4a

Insufficient data for same-age comparison.

How This Car Ages

Pass rate progression for the 1966 Triumph Tr4a as it ages.

43 yrs74.3%

→ ↑2.3%

44 yrs76.6%

→ ↓1.6%

45 yrs75.0%

→ ↑3.7%

46 yrs78.7%

→ ↓7.1%

47 yrs71.6%

→ ↑11.9%

48 yrs83.5%

→ ↓12.6%

49 yrs70.9%

→ ↑14.5%

50 yrs85.4%

→ ↓1.9%

51 yrs83.5%

→ ↑2.7%

52 yrs86.2%

→ ↓3.8%

53 yrs82.4%

→ ↑3.9%

54 yrs86.3%

→ ↑9.7%

55 yrs96.0%

→ ↓16.9%

56 yrs79.1%

→ ↑6.9%

57 yrs86.0%

→ ↑3.2%

58 yrs89.2%

📊 View as table

Age	Pass Rate	Tests
43 yrs	74.3%	218
44 yrs	76.6%	205
45 yrs	75.0%	212
46 yrs	78.7%	216
47 yrs	71.6%	218
48 yrs	83.5%	218
49 yrs	70.9%	230
50 yrs	85.4%	240
51 yrs	83.5%	224
52 yrs	86.2%	116
53 yrs	82.4%	85
54 yrs	86.3%	73
55 yrs	96.0%	50
56 yrs	79.1%	43
57 yrs	86.0%	43
58 yrs	89.2%	65

Pass Rate Trend

How the 1966 Triumph Tr4a pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2024 (58 yrs)	89.2%	65
2023 (57 yrs)	86%	43
2022 (56 yrs)	79.1%	43
2021 (55 yrs)	96%	50
2020 (54 yrs)	86.3%	73
2019 (53 yrs)	82.4%	85
2018 (52 yrs)	86.2%	116
2017 (51 yrs)	83.5%	224
2016 (50 yrs)	85.4%	240
2015 (49 yrs)	70.9%	230
2014 (48 yrs)	83.5%	218
2013 (47 yrs)	71.6%	218
2012 (46 yrs)	78.7%	216
2011 (45 yrs)	75%	212
2010 (44 yrs)	76.6%	205
2009 (43 yrs)	74.3%	218

Year-by-Year MOT Results

2009

74.3%

Age (yrs) 43Tests 218Avg Mileage 41,655Top Failure Brakes — 15.6%

2010

76.6%

Age (yrs) 44Tests 205Avg Mileage 39,832Top Failure Lamps, Reflectors and Electrical Equipment — 13.7%

2011

75.0%

Age (yrs) 45Tests 212Avg Mileage 41,265Top Failure Lamps, Reflectors and Electrical Equipment — 16.5%

2012

78.7%

Age (yrs) 46Tests 216Avg Mileage 40,894Top Failure Lamps, Reflectors and Electrical Equipment — 12.0%

2013

71.6%

Age (yrs) 47Tests 218Avg Mileage 39,754Top Failure Brakes — 32.1%

2014

83.5%

Age (yrs) 48Tests 218Avg Mileage 41,716Top Failure Lamps, Reflectors and Electrical Equipment — 19.7%

2015

70.9%

Age (yrs) 49Tests 230Avg Mileage 40,223Top Failure Lamps, Reflectors and Electrical Equipment — 29.6%

2016

85.4%

Age (yrs) 50Tests 240Avg Mileage 40,036Top Failure Lamps, Reflectors and Electrical Equipment — 18.8%

2017

83.5%

Age (yrs) 51Tests 224Avg Mileage 40,619Top Failure Brakes — 16.5%

2018

86.2%

Age (yrs) 52Tests 116Avg Mileage 38,241Top Failure Brakes — 11.2%

2019

82.4%

Age (yrs) 53Tests 85Avg Mileage 37,046Top Failure Brakes — 17.6%

2020

86.3%

Age (yrs) 54Tests 73Avg Mileage 36,128Top Failure Lamps, reflectors and electrical equipment — 13.7%

2021

96.0%

Age (yrs) 55Tests 50Avg Mileage 47,728Top Failure Suspension — 6.0%

2022

79.1%

Age (yrs) 56Tests 43Avg Mileage 50,247Top Failure Lamps, reflectors and electrical equipment — 23.3%

2023

86.0%

Age (yrs) 57Tests 43Avg Mileage 40,754Top Failure Lamps, reflectors and electrical equipment — 16.3%

2024

89.2%

Age (yrs) 58Tests 65Avg Mileage 38,310Top Failure Lamps, reflectors and electrical equipment — 4.6%

MOT results for 1966 Triumph Tr4a by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	43	74.3%	218	41,655	Brakes — 15.6%
2010	44	76.6%	205	39,832	Lamps, Reflectors and Electrical Equipment — 13.7%
2011	45	75.0%	212	41,265	Lamps, Reflectors and Electrical Equipment — 16.5%
2012	46	78.7%	216	40,894	Lamps, Reflectors and Electrical Equipment — 12.0%
2013	47	71.6%	218	39,754	Brakes — 32.1%
2014	48	83.5%	218	41,716	Lamps, Reflectors and Electrical Equipment — 19.7%
2015	49	70.9%	230	40,223	Lamps, Reflectors and Electrical Equipment — 29.6%
2016	50	85.4%	240	40,036	Lamps, Reflectors and Electrical Equipment — 18.8%
2017	51	83.5%	224	40,619	Brakes — 16.5%
2018	52	86.2%	116	38,241	Brakes — 11.2%
2019	53	82.4%	85	37,046	Brakes — 17.6%
2020	54	86.3%	73	36,128	Lamps, reflectors and electrical equipment — 13.7%
2021	55	96.0%	50	47,728	Suspension — 6.0%
2022	56	79.1%	43	50,247	Lamps, reflectors and electrical equipment — 23.3%
2023	57	86.0%	43	40,754	Lamps, reflectors and electrical equipment — 16.3%
2024	58	89.2%	65	38,310	Lamps, reflectors and electrical equipment — 4.6%

Common MOT Failures

Top failure categories across all test years for 1966 Triumph Tr4a, with age trends.

Lamps, Reflectors and Electrical Equipment

17.7%

— Consistent

Brakes

14.5%

↓ Decreases with age

Lamps, reflectors and electrical equipment

11.7%

— Consistent

Suspension

11.5%

↓ Decreases with age

Noise, emissions and leaks

10.5%

— Consistent

How Failures Change With Age

Comparing failure rates between the youngest and oldest test years.

Category	At Youngest	At Oldest	Change	Trend
Brakes	15.6% (43 yrs)	3.1% (58 yrs)	-12.5%	🟢 ↓
Suspension	11.9% (43 yrs)	3.1% (58 yrs)	-8.8%	🟢 ↓

Other Manufacture Years

1965 1966 1967

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About This Data

This page shows how Triumph Tr4a cars manufactured in 1966 perform at MOT as they age. Data spans from 2009 to 2024, covering 2,456 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.