Mercedes Benz 300 MOT Check

MOT pass rates, common failures, and reliability data for the Mercedes Benz 300. Check any 300 by registration number below.

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83.3%

Avg Pass Rate

-6.9%

vs Mercedes Benz Avg

Year Ranges

Good

Reliability

Mercedes Benz 300 — MOT Reliability Overview

The Mercedes Benz 300 has an average MOT pass rate of 83.3%, which is 6.9 percentage points below the Mercedes Benz brand average of 90.2%. This is a strong result, indicating that the 300 is well-engineered and tends to age well mechanically. Owners can expect fewer surprises at MOT time.

The most common reasons a Mercedes Benz 300 fails its MOT are a suspension pin, bush or joint excessively worn, the strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, a suspension joint dust cover missing or no longer prevents the ingress of dirt etc. If you are preparing your 300 for its MOT, checking these areas first could save you a retest fee. Our detailed fault analysis includes estimated repair costs for each failure type.

Before buying a used Mercedes Benz 300, we recommend checking the full MOT history, write-off status, outstanding finance, and stolen vehicle status. These checks can be done for free using the registration number.

MOT Pass Rate by Year

How the Mercedes Benz 300 performs at MOT across different model years.

2002

Based on 54 vehicles

96.3%Excellent

Mercedes Benz average: 90.2%

Mileage at 10yr

290k mi

2001

Based on 70 vehicles

91.4%Excellent

Mercedes Benz average: 90.2%

Mileage at 10yr

239k mi

2000

Based on 71 vehicles

94.4%Excellent

Mercedes Benz average: 90.2%

Mileage at 10yr

271k mi

1999

Based on 109 vehicles

97.2%Excellent

Mercedes Benz average: 90.2%

Mileage at 10yr

343k mi

1998

Based on 119 vehicles

88.2%Excellent

Mercedes Benz average: 90.2%

1997

Based on 134 vehicles

88.8%Excellent

Mercedes Benz average: 90.2%

1996

Based on 114 vehicles

94.7%Excellent

Mercedes Benz average: 90.2%

1995

Based on 72 vehicles

84.7%Good

Mercedes Benz average: 90.2%

1994

Based on 98 vehicles

76.5%Good

Mercedes Benz average: 90.2%

Dangerous Defects

2.9%

Retest Rate

17.6%

1993

Based on 790 vehicles

80.4%Good

Mercedes Benz average: 90.2%

Dangerous Defects

1.9%

Retest Rate

12.8%

1992

Based on 1,368 vehicles

80.8%Good

Mercedes Benz average: 90.2%

Dangerous Defects

2.0%

Retest Rate

14.4%

1991

Based on 1,425 vehicles

78.9%Good

Mercedes Benz average: 90.2%

Dangerous Defects

2.1%

Retest Rate

14.9%

1990

Based on 1,120 vehicles

81.2%Good

Mercedes Benz average: 90.2%

Dangerous Defects

2.1%

Retest Rate

15.9%

1989

Based on 2,017 vehicles

83.5%Good

Mercedes Benz average: 90.2%

Dangerous Defects

1.4%

Retest Rate

12.3%

1988

Based on 1,393 vehicles

79.8%Good

Mercedes Benz average: 90.2%

Dangerous Defects

1.4%

Retest Rate

13.3%

1987

Based on 1,049 vehicles

83.4%Good

Mercedes Benz average: 90.2%

Dangerous Defects

1.2%

Retest Rate

12.0%

1986

Based on 601 vehicles

76.5%Good

Mercedes Benz average: 90.2%

Dangerous Defects

1.8%

Retest Rate

14.9%

1985

Based on 89 vehicles

73.0%Average

Mercedes Benz average: 90.2%

Dangerous Defects

1.6%

Retest Rate

8.1%

1984

Based on 76 vehicles

80.3%Good

Mercedes Benz average: 90.2%

Dangerous Defects

1.9%

Retest Rate

1.9%

1983

Based on 36 vehicles

55.6%Below Average

Mercedes Benz average: 90.2%

Retest Rate

78.6%

Top MOT Failures — Mercedes Benz 300

The most common reasons a Mercedes Benz 300 fails its MOT, aggregated across all year ranges.

A suspension pin, bush or joint excessively worn

12.2%

The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired

4.5%

A suspension joint dust cover missing or no longer prevents the ingress of dirt etc

2.8%

A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

2.0%

The aim of a headlamp is not within limits laid down in the requirements

1.9%

Mercedes Benz 300 Common Faults & Repair Costs

Other Mercedes Benz Models

Compare MOT reliability across Mercedes Benz models.

Mercedes Benz E 300

94.2% pass rate

Mercedes Benz E

83.5% pass rate

Mercedes Benz Amg Gla 45 S 4matic+ Auto

92.7% pass rate

Mercedes Benz V

85.8% pass rate

Mercedes Benz Vito 112

87.8% pass rate

Mercedes Benz Sl 500

100.0% pass rate

Useful MOT Guides

Common MOT Failures

The most common reasons UK vehicles fail their MOT — and how to prepare.

MOT Checklist

Pre-MOT checklist to improve your chances of passing first time.

Advisory vs Failure

Understanding the difference between MOT advisories and failures.

See detailed fault analysis for Mercedes Benz 300

Mercedes Benz 300 — Frequently Asked Questions

Common questions about the Mercedes Benz 300 MOT and reliability.

What is the MOT pass rate for the Mercedes Benz 300?

The average MOT pass rate for the Mercedes Benz 300 is 83.3% compared to the Mercedes Benz average of 90.2%. Pass rates vary by year — check the year-by-year breakdown on this page for details.

What are the most common MOT failures on a Mercedes Benz 300?

The most common MOT failures on the Mercedes Benz 300 are: A suspension pin, bush or joint excessively worn (12.2%), The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired (4.5%), A suspension joint dust cover missing or no longer prevents the ingress of dirt etc (2.8%). These are the components most likely to cause an MOT failure.

Is the Mercedes Benz 300 reliable?

With an average MOT pass rate of 83.3%, the Mercedes Benz 300 is rated as "Good" for reliability. This is a strong result suggesting good build quality and fewer common defects.

How do I check the MOT history of a Mercedes Benz 300?

Enter the vehicle's registration number in the search box at the top of this page. You will instantly see the complete MOT history including every test result, mileage readings, advisories, and dangerous defects — completely free.

What mileage should I expect on a Mercedes Benz 300?

Typical mileage for the Mercedes Benz 300: 289,677 miles at 10 years. Use these benchmarks when evaluating a used 300 to spot vehicles with unusually high or low mileage.

Check Your Mercedes Benz 300's MOT History

Enter the registration number for the full MOT history — free and instant.