Mercedes 814D Reliability, MOT Pass Rate & Common Faults
Free Mercedes 814D car check
Is the Mercedes 814D reliable? We analysed 863 real MOT tests across 115 vehicles to find out.
Got a specific Mercedes 814D? Enter the reg for a free check:
The Mercedes 814D is about average for reliability based on real UK MOT data. Common problems include service brake: efficiency below requirements, parking brake: efficiency below requirements and brake binding. Here's everything you need to know before buying a used Mercedes 814D.
Mercedes 814D Number Plates
Number plates registered to a Mercedes 814D. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Mercedes 814D MOT Pass Rate by Year
How likely is a Mercedes 814D to pass its MOT? Here's the pass rate for each registration year, newest first.
Mercedes 814D Problems — What Goes Wrong?
The most common reasons a Mercedes 814D fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Mercedes 814D Mileage — What's Normal?
How many miles does a typical Mercedes 814D owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Mercedes 814D MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Mercedes 814D year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 2001 | 55 | 80.0% | 126,130 | 205,451 | 277,966 |
| 1999 | 73 | 80.8% | 84,663 | 170,705 | 423,399 |
| 1998 | 68 | 73.5% | 88,917 | 148,684 | 224,736 |
| 1997 | 65 | 63.1% | 88,992 | 121,281 | 194,599 |
Mercedes 814D Mileage Distribution
Total mileage recorded across all Mercedes 814D 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 814D
Based on MOT pass rates across all registration years with sufficient test data.
80.8% MOT pass rate from 73 tests
63.1% MOT pass rate from 65 tests
The best year to buy a used Mercedes 814D is 1999, which has the highest MOT pass rate at 80.8% across 73 tests. The 1997 model year has the lowest pass rate at 63.1% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Mercedes 814D Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Mercedes 814D THIS CAR | 74.5% | 863 | 185,701 mi | 29 yrs |
| Mercedes Motorhome | 76.7% | 14,848 | 66,873 mi | 45 yrs |
| Mercedes Unknown | 79.2% | 11,881 | 102,484 mi | 39 yrs |
| Mercedes Camper | 74.6% | 8,342 | 82,260 mi | 47 yrs |
| Audi Q3 S Line Blck ED 45 TFSI E Sa | 91.7% | 971 | 30,934 mi | — yrs |
Compared to the Mercedes Motorhome (76.7% pass rate) and the Mercedes Unknown (79.2% pass rate), the Mercedes 814D trails behind on MOT reliability.
Found a Mercedes 814D 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 814DShould you buy a used Mercedes 814D?
The Mercedes 814D has an overall MOT pass rate of 74.5% across 863 real MOT tests — roughly in line with the UK average.
The most common problems on the Mercedes 814D are service brake: efficiency below requirements (18 recorded failures), parking brake: efficiency below requirements (14), and brake binding (12). 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 Mercedes 814D owner drives around 6,172 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 814D models stay on UK roads for around 29 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.