Dennis Unknown Reliability, MOT Pass Rate & Common Faults
Free Dennis Unknown car check
Is the Dennis Unknown reliable? We analysed 1,061 real MOT tests across 474 vehicles to find out.
Got a specific Dennis Unknown? Enter the reg for a free check:
The Dennis Unknown is above average for reliability based on real UK MOT data. Common problems include outline marker lamp(s) not working, service brake: efficiency below requirements and position lamp(s) not working. Here's everything you need to know before buying a used Dennis Unknown.
Dennis Unknown Number Plates
Number plates registered to a Dennis Unknown. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Dennis Unknown MOT Pass Rate by Year
How likely is a Dennis Unknown to pass its MOT? Here's the pass rate for each registration year, newest first.
Dennis Unknown Problems — What Goes Wrong?
The most common reasons a Dennis Unknown fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Dennis Unknown Mileage — What's Normal?
How many miles does a typical Dennis Unknown owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Dennis Unknown MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Dennis Unknown year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2003 | 215 | 85.1% | 42,384 | 157,832 | 263,418 |
| 2002 | 201 | 78.1% | 44,204 | 99,445 | 295,798 |
| 2001 | 182 | 75.8% | 64,612 | 169,560 | 277,264 |
How Long Does a Dennis Unknown Last?
Based on 474 Dennis Unknown vehicles on UK roads.
Dennis Unknown Mileage Distribution
Total mileage recorded across all Dennis Unknown 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 Dennis Unknown
Based on MOT pass rates across all registration years with sufficient test data.
85.1% MOT pass rate from 215 tests
75.8% MOT pass rate from 182 tests
The best year to buy a used Dennis Unknown is 2003, which has the highest MOT pass rate at 85.1% across 215 tests. The 2001 model year has the lowest pass rate at 75.8% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Dennis Unknown Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Dennis Unknown THIS CAR | 81.4% | 1,061 | 125,160 mi | 25 yrs |
| Dennis Dart | 82% | 713 | 105,010 mi | 33 yrs |
| Dennis Elite | 89.3% | 495 | 140,237 mi | — yrs |
| Ford Galaxy Titanium Ecoblue 4X4 A | 87.6% | 475 | 32,501 mi | — yrs |
| Keeway Tx 125 E4 | 71.4% | 817 | 9,480 mi | — yrs |
Compared to the Dennis Dart (82.0% pass rate) and the Dennis Elite (89.3% pass rate), the Dennis Unknown trails behind on MOT reliability.
Found a Dennis Unknown 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 Dennis UnknownShould you buy a used Dennis Unknown?
The Dennis Unknown has an overall MOT pass rate of 81.4% across 1,061 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 Dennis Unknown are outline marker lamp(s) not working (6 recorded failures), service brake: efficiency below requirements (6), and position lamp(s) not working (6). 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 Dennis Unknown owner drives around 1,406 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 Dennis Unknown models stay on UK roads for around 25 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.