2003 Mercedes Slk 230k — MOT History by Age

How cars manufactured in 2003 perform at MOT as they age

23 years

Current Age

66.6%

Latest Pass Rate

14,355

Total Tests (All Years)

82,048 mi

Avg Mileage (Latest)

Data from official DVSA MOT testing records

Compared to Average at Age 17

This car: 66.6%

Average: 53.5%

✅ 13.1% above average (9249 models compared)

How This Car Ages

Pass rate progression for the 2003 Mercedes Slk 230k as it ages.

6 yrs77.1%

→ ↓1.8%

7 yrs75.3%

→ ↓2.5%

8 yrs72.8%

→ ↓2.6%

9 yrs70.2%

→ ↓0.6%

10 yrs69.6%

→ ↑1.7%

11 yrs71.3%

→ ↓1.4%

12 yrs69.9%

→ ↓3.3%

13 yrs66.6%

→ ↑1.6%

14 yrs68.2%

→ ↓2.3%

15 yrs65.9%

→ ↑2.6%

16 yrs68.5%

→ ↓1.9%

17 yrs66.6%

📊 View as table

Age	Pass Rate	Tests
6 yrs	77.1%	1,387
7 yrs	75.3%	1,338
8 yrs	72.8%	1,391
9 yrs	70.2%	1,379
10 yrs	69.6%	1,353
11 yrs	71.3%	1,333
12 yrs	69.9%	1,315
13 yrs	66.6%	1,291
14 yrs	68.2%	1,165
15 yrs	65.9%	804
16 yrs	68.5%	851
17 yrs	66.6%	748

Pass Rate Trend

How the 2003 Mercedes Slk 230k pass rate changes as it ages, from first MOT to most recent.

📊 View as table

Built	Pass Rate	Tests
2020 (17 yrs)	66.6%	748
2019 (16 yrs)	68.5%	851
2018 (15 yrs)	65.9%	804
2017 (14 yrs)	68.2%	1,165
2016 (13 yrs)	66.6%	1,291
2015 (12 yrs)	69.9%	1,315
2014 (11 yrs)	71.3%	1,333
2013 (10 yrs)	69.6%	1,353
2012 (9 yrs)	70.2%	1,379
2011 (8 yrs)	72.8%	1,391
2010 (7 yrs)	75.3%	1,338
2009 (6 yrs)	77.1%	1,387

Year-by-Year MOT Results

2009

77.1%

Age (yrs) 6Tests 1,387Avg Mileage 41,856Top Failure Lamps, Reflectors and Electrical Equipment — 9.4%

2010

75.3%

Age (yrs) 7Tests 1,338Avg Mileage 47,348Top Failure Lamps, Reflectors and Electrical Equipment — 11.6%

2011

72.8%

Age (yrs) 8Tests 1,391Avg Mileage 51,948Top Failure Lamps, Reflectors and Electrical Equipment — 12.2%

2012

70.2%

Age (yrs) 9Tests 1,379Avg Mileage 56,474Top Failure Lamps, Reflectors and Electrical Equipment — 13.6%

2013

69.6%

Age (yrs) 10Tests 1,353Avg Mileage 61,107Top Failure Lamps, Reflectors and Electrical Equipment — 23.1%

2014

71.3%

Age (yrs) 11Tests 1,333Avg Mileage 64,926Top Failure Lamps, Reflectors and Electrical Equipment — 23.7%

2015

69.9%

Age (yrs) 12Tests 1,315Avg Mileage 68,284Top Failure Brakes — 26.8%

2016

66.6%

Age (yrs) 13Tests 1,291Avg Mileage 72,255Top Failure Lamps, Reflectors and Electrical Equipment — 24.4%

2017

68.2%

Age (yrs) 14Tests 1,165Avg Mileage 77,861Top Failure Brakes — 26.4%

2018

65.9%

Age (yrs) 15Tests 804Avg Mileage 78,049Top Failure Brakes — 33.5%

2019

68.5%

Age (yrs) 16Tests 851Avg Mileage 79,034Top Failure Brakes — 32.7%

2020

66.6%

Age (yrs) 17Tests 748Avg Mileage 82,048Top Failure Brakes — 36.6%

MOT results for 2003 Mercedes Slk 230k by test year
Test Year▲	Age (yrs)▲▼	Pass Rate▲▼	Tests▲▼	Avg Mileage▲▼	Top Failure▲▼
2009	6	77.1%	1,387	41,856	Lamps, Reflectors and Electrical Equipment — 9.4%
2010	7	75.3%	1,338	47,348	Lamps, Reflectors and Electrical Equipment — 11.6%
2011	8	72.8%	1,391	51,948	Lamps, Reflectors and Electrical Equipment — 12.2%
2012	9	70.2%	1,379	56,474	Lamps, Reflectors and Electrical Equipment — 13.6%
2013	10	69.6%	1,353	61,107	Lamps, Reflectors and Electrical Equipment — 23.1%
2014	11	71.3%	1,333	64,926	Lamps, Reflectors and Electrical Equipment — 23.7%
2015	12	69.9%	1,315	68,284	Brakes — 26.8%
2016	13	66.6%	1,291	72,255	Lamps, Reflectors and Electrical Equipment — 24.4%
2017	14	68.2%	1,165	77,861	Brakes — 26.4%
2018	15	65.9%	804	78,049	Brakes — 33.5%
2019	16	68.5%	851	79,034	Brakes — 32.7%
2020	17	66.6%	748	82,048	Brakes — 36.6%

Common MOT Failures

Top failure categories across all test years for 2003 Mercedes Slk 230k, with age trends.

Lamps, reflectors and electrical equipment

25.4%

↑ Increases with age

Brakes

20.4%

↑ Increases with age

Suspension

17.9%

↑ Increases with age

Lamps, Reflectors and Electrical Equipment

17.6%

— Consistent

Tyres

16.5%

↑ 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	5.3% (6 yrs)	36.6% (17 yrs)	+31.3%	🔴 ↑
Suspension	6.8% (6 yrs)	27.9% (17 yrs)	+21.1%	🔴 ↑
Tyres	8.8% (6 yrs)	23.7% (17 yrs)	+14.9%	🔴 ↑

Other Manufacture Years

1996 1997 1998 1999 2000 2001 2002 2003 2004

← Back to Mercedes Slk 230k overview

Looking for the best year to buy? See the full comparison on the Mercedes Slk 230k page →

About This Data

This page shows how Mercedes Slk 230k cars manufactured in 2003 perform at MOT as they age. Data spans from 2009 to 2020, covering 14,355 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.