2004 Mercedes Slk 230k — MOT History by Age

How cars manufactured in 2004 perform at MOT as they age

22 years

Current Age

65.7%

Latest Pass Rate

6,669

Total Tests (All Years)

80,765 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Compared to Average at Age 16

This car: 65.7%

Average: 52.7%

✅ 13.0% above average (10212 models compared)

How This Car Ages

Pass rate progression for the 2004 Mercedes Slk 230k as it ages.

5 yrs81.3%

→ ↓4.2%

6 yrs77.1%

→ ↓2.8%

7 yrs74.3%

→ ↑2.4%

8 yrs76.7%

→ ↓7.5%

9 yrs69.2%

→ ↑1.9%

10 yrs71.1%

→ ↓0.5%

11 yrs70.6%

→ ↓3.0%

12 yrs67.6%

→ ↑2.1%

13 yrs69.7%

→ ↓7.7%

14 yrs62.0%

→ ↑0.8%

15 yrs62.8%

→ ↑2.9%

16 yrs65.7%

📊 View as table

Age	Pass Rate	Tests
5 yrs	81.3%	654
6 yrs	77.1%	633
7 yrs	74.3%	657
8 yrs	76.7%	626
9 yrs	69.2%	640
10 yrs	71.1%	637
11 yrs	70.6%	629
12 yrs	67.6%	618
13 yrs	69.7%	515
14 yrs	62.0%	355
15 yrs	62.8%	355
16 yrs	65.7%	350

Pass Rate Trend

How the 2004 Mercedes Slk 230k pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (16 yrs)	65.7%	350
2019 (15 yrs)	62.8%	355
2018 (14 yrs)	62%	355
2017 (13 yrs)	69.7%	515
2016 (12 yrs)	67.6%	618
2015 (11 yrs)	70.6%	629
2014 (10 yrs)	71.1%	637
2013 (9 yrs)	69.2%	640
2012 (8 yrs)	76.7%	626
2011 (7 yrs)	74.3%	657
2010 (6 yrs)	77.1%	633
2009 (5 yrs)	81.3%	654

Year-by-Year MOT Results

2009

81.3%

Age (yrs) 5Tests 654Avg Mileage 36,651Top Failure Lamps, Reflectors and Electrical Equipment — 8.7%

2010

77.1%

Age (yrs) 6Tests 633Avg Mileage 41,982Top Failure Lamps, Reflectors and Electrical Equipment — 10.3%

2011

74.3%

Age (yrs) 7Tests 657Avg Mileage 48,410Top Failure Lamps, Reflectors and Electrical Equipment — 11.7%

2012

76.7%

Age (yrs) 8Tests 626Avg Mileage 50,680Top Failure Lamps, Reflectors and Electrical Equipment — 11.0%

2013

69.2%

Age (yrs) 9Tests 640Avg Mileage 56,318Top Failure Lamps, Reflectors and Electrical Equipment — 24.5%

2014

71.1%

Age (yrs) 10Tests 637Avg Mileage 59,851Top Failure Brakes — 20.4%

2015

70.6%

Age (yrs) 11Tests 629Avg Mileage 63,671Top Failure Lamps, Reflectors and Electrical Equipment — 21.8%

2016

67.6%

Age (yrs) 12Tests 618Avg Mileage 68,615Top Failure Lamps, Reflectors and Electrical Equipment — 25.4%

2017

69.7%

Age (yrs) 13Tests 515Avg Mileage 71,469Top Failure Brakes — 24.1%

2018High Fail Rate

62.0%

Age (yrs) 14Tests 355Avg Mileage 75,535Top Failure Brakes — 28.2%

2019High Fail Rate

62.8%

Age (yrs) 15Tests 355Avg Mileage 75,501Top Failure Brakes — 37.5%

2020

65.7%

Age (yrs) 16Tests 350Avg Mileage 80,765Top Failure Brakes — 38.9%

MOT results for 2004 Mercedes Slk 230k by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	5	81.3%	654	36,651	Lamps, Reflectors and Electrical Equipment — 8.7%
2010	6	77.1%	633	41,982	Lamps, Reflectors and Electrical Equipment — 10.3%
2011	7	74.3%	657	48,410	Lamps, Reflectors and Electrical Equipment — 11.7%
2012	8	76.7%	626	50,680	Lamps, Reflectors and Electrical Equipment — 11.0%
2013	9	69.2%	640	56,318	Lamps, Reflectors and Electrical Equipment — 24.5%
2014	10	71.1%	637	59,851	Brakes — 20.4%
2015	11	70.6%	629	63,671	Lamps, Reflectors and Electrical Equipment — 21.8%
2016	12	67.6%	618	68,615	Lamps, Reflectors and Electrical Equipment — 25.4%
2017	13	69.7%	515	71,469	Brakes — 24.1%
2018	14	62.0%	355	75,535	Brakes — 28.2%
2019	15	62.8%	355	75,501	Brakes — 37.5%
2020	16	65.7%	350	80,765	Brakes — 38.9%

Common MOT Failures

Top failure categories across all test years for 2004 Mercedes Slk 230k, with age trends.

Lamps, reflectors and electrical equipment

26.5%

↑ Increases with age

Brakes

19.2%

↑ Increases with age

Lamps, Reflectors and Electrical Equipment

17.3%

↑ Increases with age

Tyres

16.2%

↑ Increases with age

Suspension

15.2%

↑ 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	2.9% (5 yrs)	38.9% (16 yrs)	+36.0%	🔴 ↑
Suspension	3.7% (5 yrs)	20.3% (16 yrs)	+16.6%	🔴 ↑
Tyres	8.1% (5 yrs)	24.6% (16 yrs)	+16.5%	🔴 ↑

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 2004 perform at MOT as they age. Data spans from 2009 to 2020, covering 6,669 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.