Ariel Square Four Reliability, MOT Pass Rate & Common Faults
Free Ariel Square Four car check
Is the Ariel Square Four reliable? We analysed 562 real MOT tests across 163 vehicles to find out.
Got a specific Ariel Square Four? Enter the reg for a free check:
The Ariel Square Four is above average for reliability based on real UK MOT data. Common problems include roller brake test the less effective brake control does not achieve an efficiency of 25%., stop lamp does not illuminate immediately a brake applies and floor brake test the less effective brake control does not achieve an efficiency of 25%.. Here's everything you need to know before buying a used Ariel Square Four.
Ariel Square Four Number Plates
Number plates registered to a Ariel Square Four. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Ariel Square Four MOT Pass Rate by Year
How likely is a Ariel Square Four to pass its MOT? Here's the pass rate for each registration year, newest first.
Ariel Square Four Problems — What Goes Wrong?
The most common reasons a Ariel Square Four fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Ariel Square Four Mileage — What's Normal?
How many miles does a typical Ariel Square Four owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Ariel Square Four MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Ariel Square Four year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1958 | 58 | 94.8% | 8,727 | 30,438 | 53,652 |
How Long Does a Ariel Square Four Last?
Based on 163 Ariel Square Four vehicles on UK roads.
Ariel Square Four Mileage Distribution
Total mileage recorded across all Ariel Square Four MOT tests. If the car you're looking at is above the 75th percentile, it's done more miles than most.
Best Year to Buy a Used Ariel Square Four
Based on MOT pass rates across all registration years with sufficient test data.
94.8% MOT pass rate from 58 tests
The best year to buy a used Ariel Square Four is 1958, which has the highest MOT pass rate at 94.8% across 58 tests.
How Does the Ariel Square Four Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Ariel Square Four THIS CAR | 92.0% | 562 | 11,269 mi | 68 yrs |
| Ariel Atom | 90.3% | 2,244 | 11,172 mi | 22 yrs |
| Ariel Arrow | 94.2% | 1,653 | 19,651 mi | 66 yrs |
| Ariel Red Hunter | 92.1% | 1,323 | 8,112 mi | 72 yrs |
| Honda Sh 125 D-d | 83.2% | 1,036 | 16,424 mi | 13 yrs |
Compared to the Ariel Atom (90.3% pass rate) and the Ariel Arrow (94.2% pass rate), the Ariel Square Four sits in the middle of the pack on MOT reliability.
Found a Ariel Square Four you like?
Run a full vehicle history check on the specific car. See finance, stolen, write-off, mileage and MOT data for that exact vehicle.
Check a specific Ariel Square FourShould you buy a used Ariel Square Four?
The Ariel Square Four has an overall MOT pass rate of 92.0% across 562 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
The most common problems on the Ariel Square Four are roller brake test the less effective brake control does not achieve an efficiency of 25%. (2 recorded failures), stop lamp does not illuminate immediately a brake applies (2), and floor brake test the less effective brake control does not achieve an efficiency of 25%. (1). These are the faults most likely to cause an MOT failure on this model, so check for them carefully on any test drive or pre-purchase inspection. Many are wear-and-tear items that can be budgeted for, but a car that's already failing on multiple fronts may signal neglected maintenance.
A typical Ariel Square Four owner drives around 178 miles per year. If the car you're looking at is significantly above this, expect more wear on suspension, brakes and tyres. If it's well below, the vehicle may have been sitting unused — check for perished rubber, corroded discs and stale fluids.
In terms of longevity, most Ariel Square Four models stay on UK roads for around 68 years — a strong showing that suggests solid build quality and readily available parts. If you're buying one that's already approaching that window, the data suggests it has plenty of life left provided it's been maintained.
Before committing to a purchase, we recommend running a full vehicle history check on the specific car. This will reveal any outstanding finance, stolen markers, write-off history and mileage discrepancies that the seller may not disclose — and that the MOT data alone can't tell you.