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Mercedes-Benz SLK Common Problems, Faults & Repair Costs (2026)

Based on official DVSA MOT test data. View the most common MOT failure categories, pass rates, and estimated repair costs for the Mercedes-Benz SLK (2004–2016).

MOT Pass Rate

80.8%1.2% below national avg (82%)

Reliability rating: Good — based on approx. 8,000 tests

Dangerous Defects

1.60%

Moderate risk

Retest Rate

13.0%

of failed tests need a retest

Top MOT Failure Categories

1

Lamps, reflectors and electrical equipment

Est. repair: £40–£200

15.0%
2

Suspension

Est. repair: £120–£450

13.8%
3

Brakes

Est. repair: £100–£350

12.0%
4

Tyres

Est. repair: £50–£120 per tyre

9.8%
5

Exhaust, fuel and emissions

Est. repair: £40–£200

8.0%

Where Faults Occur

30.0%

Front

28.0%

Rear

20.0%

Offside

Mileage Benchmarks

At 3 years

14,000 mi

At 5 years

24,000 mi

At 10 years

45,000 mi

Significantly higher or lower mileage than these benchmarks may indicate unusual usage patterns. Check the full MOT history for mileage consistency.

Is a Mercedes-Benz SLK a Good Buy?

The Mercedes-Benz SLK demonstrates above-average reliability based on MOT test data, with a 80.8% pass rate. This places it 1.2% above the national average, suggesting lower ongoing maintenance costs compared to many competitors.

While no car is without faults, lamps, reflectors and electrical equipment issues are the most common concern, affecting approximately 15.0% of failed tests. These tend to be relatively affordable to fix at £30–£150.

Mercedes-Benz SLK MOT Check & History

View detailed MOT pass rates by year, mileage benchmarks, and full test history data for the Mercedes-Benz SLK.

View Mercedes-Benz SLK MOT Data

Check a Specific Mercedes-Benz SLK

Enter a registration number to view the full MOT history for any Mercedes-Benz SLK.

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Other Mercedes-Benz Models

Mercedes-Benz C-Class

80.5%

Lamps, reflectors and electrical equipment →

Mercedes-Benz A-Class

82.8%

Lamps, reflectors and electrical equipment →

Mercedes-Benz E-Class

79.2%

Lamps, reflectors and electrical equipment →

Mercedes-Benz GLA-Class

84.5%

Lamps, reflectors and electrical equipment →

Mercedes-Benz B-Class

79.8%

Lamps, reflectors and electrical equipment →

Mercedes-Benz GLC-Class

85.2%

Lamps, reflectors and electrical equipment →

View all Mercedes-Benz models

Frequently Asked Questions

What are the most common MOT faults on a Mercedes-Benz SLK?
The top MOT failure on the Mercedes-Benz SLK is Lamps, reflectors and electrical equipment, accounting for approximately 15.0% of all failures. Other common issues include suspension and brakes.
What is the Mercedes-Benz SLK MOT pass rate?
The Mercedes-Benz SLK has an estimated MOT pass rate of 80.8%, which is 1.2% below the national average of 82%. This rates the Mercedes-Benz SLK as "Good" for MOT reliability.
Is the Mercedes-Benz SLK reliable?
Based on DVSA MOT data, the Mercedes-Benz SLK has a good reliability record with a 80.8% pass rate. It has a dangerous defect rate of 1.60% and a retest rate of 13.0%.
How much does it cost to fix common Mercedes-Benz SLK MOT failures?
Typical repair costs for Mercedes-Benz SLK MOT failures range from £30–£200 for lamps, reflectors and electrical equipment issues to £120–£450 for suspension problems. Prices are estimates based on typical UK independent garage rates.
What mileage should a Mercedes-Benz SLK have?
Based on MOT test data, the average Mercedes-Benz SLK covers approximately 14,000 mi by 3 years, 24,000 mi by 5 years, and 45,000 mi by 10 years. Significantly higher or lower mileage may warrant closer inspection.
Should I buy a used Mercedes-Benz SLK?
The Mercedes-Benz SLK is generally a solid choice based on MOT data. Check the full MOT history of any specific vehicle before purchasing, paying particular attention to lamps, reflectors and electrical equipment issues and mileage consistency.
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