1981 Mercedes 300 MOT Pass Rate
Pass rate for 300 models manufactured in 1981, based on 67 real MOT test results.
Data from official DVSA MOT testing records
1981 Mercedes 300 MOT Analysis
The 1981 Mercedes 300 has an MOT pass rate of 44.8% based on 67 tests — significantly below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 153,957 miles on the odometer. With a 55.2% failure rate, the 1981 300 is rated as "Very Poor" for MOT reliability.
The leading cause of MOT failure for the 1981 Mercedes 300 is Driver's View of the Road, responsible for 3.0% of failures. Driver's View of the Road issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs range from £100–400. Exhaust, Fuel and Emissions is the second most common issue at 1.5%. Steering follows at 1.5%.
Top failures specific to 1981 models only. The overall 300 page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Driver's View Of The Road | 3.0% | 2 |
| 2 | Exhaust, Fuel And Emissions | 1.5% | 1 |
| 3 | Steering | 1.5% | 1 |
| 4 | Brakes | 1.5% | 1 |
Failures per 10,000 Miles
avg. 153,957 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
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| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Visibility | 0.19 | 3.0% | 2 |
| Emissions & Exhaust | 0.10 | 1.5% | 1 |
| Steering | 0.10 | 1.5% | 1 |
| Brakes | 0.10 | 1.5% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1981 Mercedes 300 has an MOT pass rate of 44.8% based on 67 tests — significantly below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 153,957 miles on the odometer. With a 55.2% failure rate, the 1981 300 is rated as "Very Poor" for MOT reliability.
If you own or are considering buying a 1981 Mercedes 300, be prepared for above-average maintenance costs. Before your MOT, pay particular attention to driver's view of the road: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights. With an average mileage of 153,957 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Driver's View of the Road — 3.0% of failures
Driver's View of the Road issues account for 3.0% of MOT failures on 1981 Mercedes 300 models. Driver's View of the Road issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Exhaust, Fuel and Emissions — 1.5% of failures
Exhaust, Fuel and Emissions issues account for 1.5% of MOT failures on 1981 Mercedes 300 models. Emissions failures occur when exhaust gases exceed legal limits for carbon monoxide (CO), hydrocarbons (HC), or particulate matter (diesel). Common causes include faulty oxygen sensors, clogged catalytic converters, or DPF issues on diesel vehicles. Typical repair costs: £100–1,000+. Pre-MOT check: If the engine management light is on, get it diagnosed before the MOT. For diesel cars, ensure the DPF has completed a regeneration cycle. Regular servicing and using premium fuel before the test can help.
Steering — 1.5% of failures
Steering issues account for 1.5% of MOT failures on 1981 Mercedes 300 models. Steering failures include excessive play in the steering wheel, leaking power steering fluid, worn track rod ends, and damaged steering rack. These affect vehicle control and are closely related to suspension wear. Typical repair costs: £150–600. Pre-MOT check: Check for excessive steering wheel play (more than a few inches of free movement). Listen for whining from the power steering pump. Look for fluid leaks under the car near the front wheels.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.