Ajs 18S Reliability, MOT Pass Rate & Common Faults
Free Ajs 18S car check
Is the Ajs 18S reliable? We analysed 580 real MOT tests across 133 vehicles to find out.
Got a specific Ajs 18S? Enter the reg for a free check:
The Ajs 18S is above average for reliability based on real UK MOT data. Common problems include stop lamp does not illuminate immediately a brake applies, position lamp does not illuminate immediately when switched on and horn not working. Here's everything you need to know before buying a used Ajs 18S.
Ajs 18S Number Plates
Number plates registered to a Ajs 18S. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Ajs 18S MOT Pass Rate by Year
How likely is a Ajs 18S to pass its MOT? Here's the pass rate for each registration year, newest first.
Ajs 18S Problems — What Goes Wrong?
The most common reasons a Ajs 18S fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Ajs 18S Mileage — What's Normal?
How many miles does a typical Ajs 18S owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Ajs 18S MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Ajs 18S year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1957 | 60 | 96.7% | 11,728 | 28,770 | 41,904 |
| 1953 | 66 | 98.5% | 1,673 | 4,749 | 14,308 |
How Long Does a Ajs 18S Last?
Based on 133 Ajs 18S vehicles on UK roads.
Ajs 18S Mileage Distribution
Total mileage recorded across all Ajs 18S 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 Ajs 18S
Based on MOT pass rates across all registration years with sufficient test data.
98.5% MOT pass rate from 66 tests
96.7% MOT pass rate from 60 tests
The best year to buy a used Ajs 18S is 1953, which has the highest MOT pass rate at 98.5% across 66 tests. The 1957 model year has the lowest pass rate at 96.7% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Ajs 18S Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Ajs 18S THIS CAR | 93.1% | 580 | 17,230 mi | 73 yrs |
| Ajs Modena | 79.2% | 7,928 | 2,950 mi | 12 yrs |
| Ajs Modena 125 | 81.5% | 3,197 | 2,430 mi | — yrs |
| Ajs Dd | 74.8% | 2,573 | 3,914 mi | 18 yrs |
| Bsa Gold Flash | 93% | 974 | 17,442 mi | 68 yrs |
Compared to the Ajs Modena (79.2% pass rate) and the Ajs Modena 125 (81.5% pass rate), the Ajs 18S outperforms both on MOT reliability.
Found a Ajs 18S 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 Ajs 18SShould you buy a used Ajs 18S?
The Ajs 18S has an overall MOT pass rate of 93.1% across 580 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 Ajs 18S are stop lamp does not illuminate immediately a brake applies (5 recorded failures), position lamp does not illuminate immediately when switched on (4), and horn not working (3). 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 Ajs 18S owner drives around 312 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 Ajs 18S models stay on UK roads for around 73 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.