Most Reliable Proton Models: Real MOT Data Analysis
We analysed 2,870 real UK MOT tests to reveal which Proton models pass most often, which years to buy, and which to avoid entirely.
2,870 MOT tests analysed
Real DVSA data covering every Proton model from 2000-2023
Key Findings
Most Reliable Model
Insufficient data
N/A
Best Single Year
Insufficient data
N/A
Proton vs National Average
55.7% vs 71.4%
-15.8% below average
Proven Durability Champion
JUMBUCK
+0.7% at 18-20 years
With 2,870 MOT tests in the DVSA database, Proton has limited test data compared to mainstream manufacturers. Here's what that data reveals about which models perform best.
This isn't survey data or owner opinions. These are actual pass/fail results from UK garages, covering Proton models sold in the UK from 2000 to 2023.
How Proton Compares to Rivals
Proton ranks #176 out of 180 manufacturers with a 55.7% average MOT pass rate. That's below the national average of 71.4%:
| Manufacturer | Pass Rate | Rank | Tests Analysed |
|---|---|---|---|
| Toyota | 73.8% | #115 | 1,637,457 |
| Volkswagen | 71.9% | #129 | 3,034,850 |
| Nissan | 68.6% | #142 | 1,626,183 |
| Ford | 68.5% | #143 | 4,473,074 |
| Vauxhall | 65.4% | #155 | 3,052,659 |
| Proton | 55.7% | #176 | 2,870 |
The verdict: Toyota maintains a lead among competitors, while Proton sits at #176.
Best Proton Models by MOT Pass Rate
Looking at overall reliability across all years, here's how Proton's core models rank against the 71.4% national average:
| Model | Pass Rate | vs National (71.4%) | Tests | Years |
|---|
* Compared to overall 71.4% national average across all years. For year-adjusted comparisons that account for newer cars passing more often, see individual model breakdowns below.
Proven Durability Champions: Which Proton Models Age Best?
Here's how Proton models have performed over 11+ years of real-world MOT testing, compared against the national average for cars of the same age:
High-confidence data: Only vehicles with 11+ years of MOT history and 100+ tests are included in this ranking.
| Model | Year | Fuel | vs Same-Age Average | Tested At | Pass Rate |
|---|---|---|---|---|---|
| JUMBUCK | - | All | +0.7% | 18-20 years | 56.8% |
How to read this: A score of "+15%" means the model passes MOTs 15 percentage points more often than the average car of the same age. These are proven results from vehicles that have genuinely aged well.
Proton Hybrids vs Petrol vs Diesel
Here's how Proton petrol models perform:
| Fuel Type | Average Pass Rate | vs National | Tests |
|---|---|---|---|
| Petrol | 55.9% | -15.5% | 2,814 |
What Goes Wrong on Protons?
When Protons fail MOTs, these are the most common causes:
| Failure Category | Total Failures |
|---|---|
| 1. Lamps, reflectors and electrical equipment | 633 |
| 2. Brakes | 533 |
| 3. Suspension | 412 |
| 4. Body, chassis, structure | 292 |
| 5. Noise, emissions and leaks | 277 |
| 6. Tyres | 215 |
| 7. Visibility | 211 |
Pre-MOT checklist for Proton owners:
- Check all bulbs (number plate lights are commonly missed)
- Check brake pad thickness and disc condition
- Inspect suspension bushes and anti-roll bar links
- Check exhaust system for leaks and emissions
Frequently Asked Questions
Our Buying Recommendations
Best If Buying Nearly New
2019-2023 models with highest early pass rates
- Limited data for recent models
Note: Long-term durability not yet proven for these newer models
Best If Buying Used (Proven)
11+ years of proven durability data
- Limited proven durability data available
Proton Models to Avoid (Proven Poor)
Proven below average at 11+ years - not just old, genuinely problematic
- No major proven reliability concerns
About This Data
This analysis uses real MOT test results from the DVSA database, covering 2,870 tests on Proton vehicles between 2000 and 2023.
Year-Adjusted Scoring (v2.1): In year-by-year breakdowns, each vehicle is compared against the national average for vehicles of the same model year. This removes the natural bias where newer cars pass more often, allowing fair comparisons across eras.
Evidence-Tiered Durability: We separate "proven durability" (vehicles tested at 11+ years old) from "early performers" (3-6 years old). Only vehicles with proven long-term data are used for durability claims. Age-band comparisons use weighted national averages.
Minimum thresholds: 100 tests for proven durability rankings, 100 tests for early performer rankings. Pass rates are calculated as first-time passes, excluding retests.
The overall national average MOT pass rate is 71.44% based on 32,300,000 tests across all manufacturers. Year-specific averages range from ~59% (2009 vehicles) to ~88% (2020 vehicles).
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