1966 Triumph Tr4 — MOT History by Age

How cars manufactured in 1966 perform at MOT as they age

60 years

Current Age

67.8%

Latest Pass Rate

409

Total Tests (All Years)

41,060 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 1966 Triumph Tr4 as it ages.

43 yrs72.0%

→ ↑7.1%

44 yrs79.1%

→ ↑2.5%

45 yrs81.6%

→ ↑3.4%

46 yrs85.0%

→ ↓0.6%

47 yrs84.4%

→ ↓4.8%

48 yrs79.6%

→ ↓9.1%

49 yrs70.5%

→ ↑10.0%

50 yrs80.5%

→ ↓12.7%

51 yrs67.8%

📊 View as table

Age	Pass Rate	Tests
43 yrs	72.0%	50
44 yrs	79.1%	43
45 yrs	81.6%	38
46 yrs	85.0%	40
47 yrs	84.4%	45
48 yrs	79.6%	49
49 yrs	70.5%	44
50 yrs	80.5%	41
51 yrs	67.8%	59

Pass Rate Trend

How the 1966 Triumph Tr4 pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2017 (51 yrs)	67.8%	59
2016 (50 yrs)	80.5%	41
2015 (49 yrs)	70.5%	44
2014 (48 yrs)	79.6%	49
2013 (47 yrs)	84.4%	45
2012 (46 yrs)	85%	40
2011 (45 yrs)	81.6%	38
2010 (44 yrs)	79.1%	43
2009 (43 yrs)	72%	50

Year-by-Year MOT Results

2009

72.0%

Age (yrs) 43Tests 50Avg Mileage 39,945Top Failure Lamps, Reflectors and Electrical Equipment — 18.0%

2010

79.1%

Age (yrs) 44Tests 43Avg Mileage 39,548Top Failure Suspension — 14.0%

2011

81.6%

Age (yrs) 45Tests 38Avg Mileage 40,226Top Failure Lamps, Reflectors and Electrical Equipment — 10.5%

2012

85.0%

Age (yrs) 46Tests 40Avg Mileage 44,390Top Failure Brakes — 12.5%

2013

84.4%

Age (yrs) 47Tests 45Avg Mileage 42,476Top Failure Lamps, Reflectors and Electrical Equipment — 26.7%

2014

79.6%

Age (yrs) 48Tests 49Avg Mileage 42,010Top Failure Suspension — 18.4%

2015

70.5%

Age (yrs) 49Tests 44Avg Mileage 41,301Top Failure Brakes — 31.8%

2016

80.5%

Age (yrs) 50Tests 41Avg Mileage 40,807Top Failure Lamps, Reflectors and Electrical Equipment — 17.1%

2017

67.8%

Age (yrs) 51Tests 59Avg Mileage 41,060Top Failure Brakes — 39.0%

MOT results for 1966 Triumph Tr4 by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	43	72.0%	50	39,945	Lamps, Reflectors and Electrical Equipment — 18.0%
2010	44	79.1%	43	39,548	Suspension — 14.0%
2011	45	81.6%	38	40,226	Lamps, Reflectors and Electrical Equipment — 10.5%
2012	46	85.0%	40	44,390	Brakes — 12.5%
2013	47	84.4%	45	42,476	Lamps, Reflectors and Electrical Equipment — 26.7%
2014	48	79.6%	49	42,010	Suspension — 18.4%
2015	49	70.5%	44	41,301	Brakes — 31.8%
2016	50	80.5%	41	40,807	Lamps, Reflectors and Electrical Equipment — 17.1%
2017	51	67.8%	59	41,060	Brakes — 39.0%

Common MOT Failures

Top failure categories across all test years for 1966 Triumph Tr4, with age trends.

Brakes

17.7%

↑ Increases with age

Lamps, Reflectors and Electrical Equipment

17.5%

↑ Increases with age

Suspension

15.9%

↑ Increases with age

Body, Structure and General Items

13.6%

— Consistent

Steering

9.5%

↑ 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
Brakes	16.0% (43 yrs)	39.0% (51 yrs)	+23.0%	🔴 ↑
Lamps, Reflectors and Electrical Equipment	18.0% (43 yrs)	33.9% (51 yrs)	+15.9%	🔴 ↑
Suspension	18.0% (43 yrs)	32.2% (51 yrs)	+14.2%	🔴 ↑
Steering	10.0% (43 yrs)	13.6% (51 yrs)	+3.6%	🔴 ↑

Other Manufacture Years

1962 1963 1964 1965 1966 1967

← Back to Triumph Tr4 overview

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About This Data

This page shows how Triumph Tr4 cars manufactured in 1966 perform at MOT as they age. Data spans from 2009 to 2017, covering 409 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.