1991 Westfield Sei MOT Pass Rate
Pass rate for Sei models manufactured in 1991, based on 77 real MOT test results.
Data from official DVSA MOT testing records
1991 Westfield Sei MOT Analysis
The 1991 Westfield Sei has an MOT pass rate of 90.9% based on 77 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 21,919 miles on the odometer. With a 9.1% failure rate, the 1991 Sei is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1991 Westfield Sei is Noise, emissions and leaks, responsible for 1.3% 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+.
Top failures specific to 1991 models only. The overall Sei 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 | Noise, Emissions And Leaks | 1.3% | 1 |
Failures per 10,000 Miles
avg. 21,919 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 |
|---|---|---|---|
| Noise, emissions and leaks | 0.59 | 1.3% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Westfield Sei has an MOT pass rate of 90.9% based on 77 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 21,919 miles on the odometer. With a 9.1% failure rate, the 1991 Sei is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1991 Westfield Sei, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to noise, emissions and leaks: 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 relatively low average mileage of 21,919 miles, many of these vehicles are still in good mechanical condition.
Noise, emissions and leaks — 1.3% of failures
Noise, emissions and leaks issues account for 1.3% of MOT failures on 1991 Westfield Sei 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.