Mercedes Unknown Reliability, MOT Pass Rate & Common Faults
Free Mercedes Unknown car check
Is the Mercedes Unknown reliable? We analysed 11,881 real MOT tests across 4,378 vehicles to find out.
Got a specific Mercedes Unknown? Enter the reg for a free check:
The Mercedes Unknown is above average for reliability based on real UK MOT data. Here's everything you need to know before buying a used Mercedes Unknown.
Mercedes Unknown Number Plates
Number plates registered to a Mercedes Unknown. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Mercedes Unknown MOT Pass Rate by Year
How likely is a Mercedes Unknown to pass its MOT? Here's the pass rate for each registration year, newest first.
Mercedes Unknown Common Faults & Problems
These are the most common serious faults found on Mercedes Unknown models during MOT testing — flagged as dangerous or major failures that need immediate attention.
Mercedes Unknown Mileage — What's Normal?
How many miles does a typical Mercedes Unknown owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Mercedes Unknown MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Mercedes Unknown year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2022 | 217 | 89.9% | 8,404 | 13,069 | 17,185 |
| 2021 | 288 | 89.2% | 8,089 | 13,121 | 21,582 |
| 2020 | 283 | 91.5% | 9,446 | 14,855 | 26,518 |
| 2019 | 210 | 88.1% | 9,242 | 15,848 | 25,921 |
| 2018 | 408 | 90.2% | 11,209 | 18,927 | 46,297 |
| 2017 | 356 | 92.7% | 10,312 | 17,647 | 29,766 |
| 2016 | 504 | 86.1% | 16,340 | 30,471 | 68,629 |
| 2015 | 383 | 85.4% | 20,441 | 37,766 | 99,272 |
| 2014 | 395 | 87.1% | 19,968 | 37,388 | 66,412 |
| 2013 | 467 | 88.2% | 20,335 | 32,134 | 54,149 |
| 2012 | 169 | 82.8% | 30,556 | 77,833 | 173,788 |
| 2011 | 85 | 82.4% | 51,714 | 79,216 | 138,603 |
| 2010 | 148 | 76.4% | 78,509 | 155,623 | 316,050 |
| 2009 | 604 | 77.5% | 82,111 | 133,304 | 236,286 |
| 2008 | 465 | 77.6% | 94,648 | 168,632 | 255,607 |
| 2007 | 673 | 76.7% | 93,104 | 155,419 | 261,334 |
| 2006 | 484 | 75.0% | 67,852 | 135,257 | 229,354 |
| 2005 | 455 | 76.3% | 87,786 | 149,152 | 287,673 |
| 2004 | 480 | 70.2% | 73,088 | 180,833 | 325,537 |
| 2003 | 353 | 73.7% | 76,887 | 144,358 | 252,301 |
How Long Does a Mercedes Unknown Last?
Based on 4,378 Mercedes Unknown vehicles on UK roads.
Mercedes Unknown Mileage Distribution
Total mileage recorded across all Mercedes 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 Mercedes Unknown
Based on MOT pass rates across all registration years with sufficient test data.
92.7% MOT pass rate from 356 tests
63.8% MOT pass rate from 116 tests
The best year to buy a used Mercedes Unknown is 2017, which has the highest MOT pass rate at 92.7% across 356 tests. The 1997 model year has the lowest pass rate at 63.8% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Mercedes Unknown Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Mercedes Unknown THIS CAR | 79.2% | 11,881 | 102,484 mi | 39 yrs |
| Mercedes Motorhome | 76.7% | 14,848 | 66,873 mi | 45 yrs |
| Mercedes Camper | 74.6% | 8,342 | 82,260 mi | 47 yrs |
| Mercedes Ml 250 | 81.3% | 7,460 | 78,586 mi | 20 yrs |
| Austin Healey 3000 | 85.3% | 8,988 | 30,527 mi | 67 yrs |
Compared to the Mercedes Motorhome (76.7% pass rate) and the Mercedes Camper (74.6% pass rate), the Mercedes Unknown outperforms both on MOT reliability.
Found a Mercedes 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 Mercedes UnknownShould you buy a used Mercedes Unknown?
The Mercedes Unknown has an overall MOT pass rate of 79.2% across 11,881 real MOT tests — comfortably above the UK average, which puts it among the more reliable models on UK roads.
On the safety side, the most frequently flagged dangerous fault is parking brake efficiency less than 50% of the required value. Dangerous faults cause an immediate MOT failure and mean the vehicle is not roadworthy until repaired. If you're viewing a Mercedes Unknown with an expired or recently passed MOT, ask the seller whether any dangerous faults were found and fixed during the last test.
A typical Mercedes Unknown owner drives around 3,416 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 Mercedes Unknown models stay on UK roads for around 39 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.