1999 Mercedes Slk 230k — MOT History by Age

How cars manufactured in 1999 perform at MOT as they age

27 years

Current Age

65.1%

Latest Pass Rate

35,617

Total Tests (All Years)

90,152 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 1999 Mercedes Slk 230k as it ages.

10 yrs72.2%

→ ↓1.3%

11 yrs70.9%

→ ↓2.0%

12 yrs68.9%

→ ↓0.8%

13 yrs68.1%

→ ↓0.6%

14 yrs67.5%

→ ↓1.1%

15 yrs66.4%

→ ↑0.9%

16 yrs67.3%

→ ↓1.5%

17 yrs65.8%

→ ↑3.0%

18 yrs68.8%

→ ↓1.0%

19 yrs67.8%

→ ↓0.6%

20 yrs67.2%

→ ↓2.1%

21 yrs65.1%

📊 View as table

Age	Pass Rate	Tests
10 yrs	72.2%	3,632
11 yrs	70.9%	3,546
12 yrs	68.9%	3,570
13 yrs	68.1%	3,529
14 yrs	67.5%	3,409
15 yrs	66.4%	3,340
16 yrs	67.3%	3,232
17 yrs	65.8%	3,089
18 yrs	68.8%	2,844
19 yrs	67.8%	1,914
20 yrs	67.2%	1,882
21 yrs	65.1%	1,630

Pass Rate Trend

How the 1999 Mercedes Slk 230k pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (21 yrs)	65.1%	1,630
2019 (20 yrs)	67.2%	1,882
2018 (19 yrs)	67.8%	1,914
2017 (18 yrs)	68.8%	2,844
2016 (17 yrs)	65.8%	3,089
2015 (16 yrs)	67.3%	3,232
2014 (15 yrs)	66.4%	3,340
2013 (14 yrs)	67.5%	3,409
2012 (13 yrs)	68.1%	3,529
2011 (12 yrs)	68.9%	3,570
2010 (11 yrs)	70.9%	3,546
2009 (10 yrs)	72.2%	3,632

Year-by-Year MOT Results

2009

72.2%

Age (yrs) 10Tests 3,632Avg Mileage 62,955Top Failure Lamps, Reflectors and Electrical Equipment — 16.1%

2010

70.9%

Age (yrs) 11Tests 3,546Avg Mileage 67,632Top Failure Lamps, Reflectors and Electrical Equipment — 17.7%

2011

68.9%

Age (yrs) 12Tests 3,570Avg Mileage 71,281Top Failure Lamps, Reflectors and Electrical Equipment — 18.9%

2012

68.1%

Age (yrs) 13Tests 3,529Avg Mileage 75,122Top Failure Lamps, Reflectors and Electrical Equipment — 20.7%

2013

67.5%

Age (yrs) 14Tests 3,409Avg Mileage 78,524Top Failure Lamps, Reflectors and Electrical Equipment — 39.2%

2014

66.4%

Age (yrs) 15Tests 3,340Avg Mileage 81,305Top Failure Lamps, Reflectors and Electrical Equipment — 44.0%

2015

67.3%

Age (yrs) 16Tests 3,232Avg Mileage 84,025Top Failure Lamps, Reflectors and Electrical Equipment — 40.2%

2016

65.8%

Age (yrs) 17Tests 3,089Avg Mileage 86,057Top Failure Lamps, Reflectors and Electrical Equipment — 41.7%

2017

68.8%

Age (yrs) 18Tests 2,844Avg Mileage 87,764Top Failure Lamps, Reflectors and Electrical Equipment — 39.9%

2018

67.8%

Age (yrs) 19Tests 1,914Avg Mileage 87,970Top Failure Brakes — 33.2%

2019

67.2%

Age (yrs) 20Tests 1,882Avg Mileage 89,360Top Failure Brakes — 42.0%

2020

65.1%

Age (yrs) 21Tests 1,630Avg Mileage 90,152Top Failure Lamps, reflectors and electrical equipment — 47.9%

MOT results for 1999 Mercedes Slk 230k by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	10	72.2%	3,632	62,955	Lamps, Reflectors and Electrical Equipment — 16.1%
2010	11	70.9%	3,546	67,632	Lamps, Reflectors and Electrical Equipment — 17.7%
2011	12	68.9%	3,570	71,281	Lamps, Reflectors and Electrical Equipment — 18.9%
2012	13	68.1%	3,529	75,122	Lamps, Reflectors and Electrical Equipment — 20.7%
2013	14	67.5%	3,409	78,524	Lamps, Reflectors and Electrical Equipment — 39.2%
2014	15	66.4%	3,340	81,305	Lamps, Reflectors and Electrical Equipment — 44.0%
2015	16	67.3%	3,232	84,025	Lamps, Reflectors and Electrical Equipment — 40.2%
2016	17	65.8%	3,089	86,057	Lamps, Reflectors and Electrical Equipment — 41.7%
2017	18	68.8%	2,844	87,764	Lamps, Reflectors and Electrical Equipment — 39.9%
2018	19	67.8%	1,914	87,970	Brakes — 33.2%
2019	20	67.2%	1,882	89,360	Brakes — 42.0%
2020	21	65.1%	1,630	90,152	Lamps, reflectors and electrical equipment — 47.9%

Common MOT Failures

Top failure categories across all test years for 1999 Mercedes Slk 230k, with age trends.

Lamps, reflectors and electrical equipment

38.0%

↑ Increases with age

Lamps, Reflectors and Electrical Equipment

29.4%

— Consistent

Brakes

27.2%

↑ Increases with age

Suspension

19.2%

↑ Increases with age

Tyres

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
Brakes	9.3% (10 yrs)	42.9% (21 yrs)	+33.6%	🔴 ↑
Suspension	7.8% (10 yrs)	35.4% (21 yrs)	+27.6%	🔴 ↑
Tyres	9.2% (10 yrs)	26.6% (21 yrs)	+17.4%	🔴 ↑

Other Manufacture Years

1996 1997 1998 1999 2000 2001 2002 2003 2004

← Back to Mercedes Slk 230k overview

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About This Data

This page shows how Mercedes Slk 230k cars manufactured in 1999 perform at MOT as they age. Data spans from 2009 to 2020, covering 35,617 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.