1991 Mercedes 300 Ges MOT Pass Rate
Pass rate for 300 Ges models manufactured in 1991, based on 44 real MOT test results.
Data from official DVSA MOT testing records
1991 Mercedes 300 Ges MOT Analysis
The 1991 Mercedes 300 Ges has an MOT pass rate of 54.5% based on 44 tests — below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 124,781 miles on the odometer. With a 45.5% failure rate, the 1991 300 Ges is rated as "Poor" for MOT reliability.
The leading cause of MOT failure for the 1991 Mercedes 300 Ges is Exhaust, Fuel and Emissions, responsible for 2.3% of failures. 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 range from £100–1,000+. Lamps, Reflectors and Electrical Equipment is the second most common issue at 2.3%. Non-component advisories follows at 2.3%.
Top failures specific to 1991 models only. The overall 300 Ges page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
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| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Exhaust, Fuel And Emissions | 2.3% | 1 |
| 2 | Lamps, Reflectors And Electrical Equipment | 2.3% | 1 |
| 3 | Non-component Advisories | 2.3% | 1 |
Failures per 10,000 Miles
avg. 124,781 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 |
|---|---|---|---|
| Emissions & Exhaust | 0.18 | 2.3% | 1 |
| Lamps & Electrical | 0.18 | 2.3% | 1 |
| Non-component advisories | 0.18 | 2.3% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Mercedes 300 Ges has an MOT pass rate of 54.5% based on 44 tests — below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 124,781 miles on the odometer. With a 45.5% failure rate, the 1991 300 Ges is rated as "Poor" for MOT reliability.
If you own or are considering buying a 1991 Mercedes 300 Ges, be prepared for above-average maintenance costs. Before your MOT, pay particular attention to exhaust, fuel and emissions: 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. With an average mileage of 124,781 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Exhaust, Fuel and Emissions — 2.3% of failures
Exhaust, Fuel and Emissions issues account for 2.3% of MOT failures on 1991 Mercedes 300 Ges 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.
Lamps, Reflectors and Electrical Equipment — 2.3% of failures
Lamps, Reflectors and Electrical Equipment issues account for 2.3% of MOT failures on 1991 Mercedes 300 Ges models. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Non-component advisories — 2.3% of failures
Non-component advisories issues account for 2.3% of MOT failures on 1991 Mercedes 300 Ges models. Non-component advisories 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.