1991 Proton Gls MOT Pass Rate
Pass rate for Gls models manufactured in 1991, based on 67 real MOT test results.
Data from official DVSA MOT testing records
1991 Proton Gls MOT Analysis
The 1991 Proton Gls has an MOT pass rate of 55.2% based on 67 tests — slightly below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 72,779 miles on the odometer. With a 44.8% failure rate, the 1991 Gls is rated as "Below Average" for MOT reliability.
The leading cause of MOT failure for the 1991 Proton Gls is Suspension, responsible for 3.0% of failures. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs range from £200–500. Tyres is the second most common issue at 3.0%. Exhaust, Fuel and Emissions follows at 1.5%.
Top failures specific to 1991 models only. The overall Gls 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 | Suspension | 3.0% | 2 |
| 2 | Tyres | 3.0% | 2 |
| 3 | Exhaust, Fuel And Emissions | 1.5% | 1 |
Failures per 10,000 Miles
avg. 72,779 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 |
|---|---|---|---|
| Suspension | 0.41 | 3.0% | 2 |
| Tyres | 0.41 | 3.0% | 2 |
| Emissions & Exhaust | 0.21 | 1.5% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1991 Proton Gls has an MOT pass rate of 55.2% based on 67 tests — slightly below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 72,779 miles on the odometer. With a 44.8% failure rate, the 1991 Gls is rated as "Below Average" for MOT reliability.
If you own or are considering buying a 1991 Proton Gls, budget for potential repairs before each MOT. Before your MOT, pay particular attention to suspension: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks. At 72,779 average miles, these vehicles are in the mid-range where component wear starts to become a factor.
Suspension — 3.0% of failures
Suspension issues account for 3.0% of MOT failures on 1991 Proton Gls models. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Tyres — 3.0% of failures
Tyres issues account for 3.0% of MOT failures on 1991 Proton Gls models. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Exhaust, Fuel and Emissions — 1.5% of failures
Exhaust, Fuel and Emissions issues account for 1.5% of MOT failures on 1991 Proton Gls 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.