Mercedes 709D Reliability, MOT Pass Rate & Common Faults
Free Mercedes 709D car check
Is the Mercedes 709D reliable? We analysed 974 real MOT tests across 123 vehicles to find out.
Got a specific Mercedes 709D? Enter the reg for a free check:
The Mercedes 709D is about average for reliability based on real UK MOT data. Common problems include parking brake: efficiency below requirements, brake pipe excessively corroded and service brake: efficiency below requirements. Here's everything you need to know before buying a used Mercedes 709D.
Mercedes 709D Number Plates
Number plates registered to a Mercedes 709D. Click on any registration for full vehicle details — including MOT history, mileage records, previous owners and damage history.
Mercedes 709D MOT Pass Rate by Year
How likely is a Mercedes 709D to pass its MOT? Here's the pass rate for each registration year, newest first.
Mercedes 709D Problems — What Goes Wrong?
The most common reasons a Mercedes 709D fails its MOT, ranked by how often they occur. Check for these problems before you buy.
Mercedes 709D Mileage — What's Normal?
How many miles does a typical Mercedes 709D owner drive per year? Use this to check if a car you're looking at has suspiciously low or high mileage.
Mercedes 709D MOT Data by Registration Year
Full breakdown of pass rate and mileage for each year. Use this to compare the Mercedes 709D year you're looking at.
| Year | Tests | Pass Rate | Low Mi. | Typical Mi. | High Mi. |
|---|---|---|---|---|---|
| 1995 | 80 | 68.8% | 120,508 | 270,476 | 325,438 |
| 1994 | 66 | 63.6% | 26,853 | 42,491 | 52,149 |
| 1993 | 69 | 59.4% | 144,111 | 276,223 | 439,530 |
| 1992 | 62 | 69.4% | 245,892 | 378,800 | 476,380 |
| 1991 | 54 | 64.8% | 124,006 | 226,324 | 356,616 |
| 1990 | 135 | 68.9% | 188,628 | 276,348 | 312,932 |
| 1989 | 197 | 62.9% | 128,519 | 202,392 | 300,177 |
| 1988 | 114 | 67.5% | 89,189 | 222,171 | 445,401 |
| 1987 | 95 | 66.3% | 238,288 | 292,553 | 339,800 |
| 1986 | 56 | 64.3% | 234,205 | 338,397 | 419,295 |
How Long Does a Mercedes 709D Last?
Based on 123 Mercedes 709D vehicles on UK roads.
Mercedes 709D Mileage Distribution
Total mileage recorded across all Mercedes 709D 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 709D
Based on MOT pass rates across all registration years with sufficient test data.
69.4% MOT pass rate from 62 tests
59.4% MOT pass rate from 69 tests
The best year to buy a used Mercedes 709D is 1992, which has the highest MOT pass rate at 69.4% across 62 tests. The 1993 model year has the lowest pass rate at 59.4% — if you're looking at one from that year, budget for potential repairs and get a thorough pre-purchase inspection.
How Does the Mercedes 709D Compare?
MOT pass rates compared to similar models. Click any model for the full breakdown.
| Model | Pass Rate | Tests | Typical Mileage | Lifespan |
|---|---|---|---|---|
| Mercedes 709D THIS CAR | 65.8% | 974 | 252,941 mi | 40 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 |
| Peugeot 3008 GT Line Bluehdi S/s Auto | 92.7% | 343 | 55,549 mi | — yrs |
Compared to the Mercedes Motorhome (76.7% pass rate) and the Mercedes Unknown (79.2% pass rate), the Mercedes 709D trails behind on MOT reliability.
Found a Mercedes 709D 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 709DShould you buy a used Mercedes 709D?
The Mercedes 709D has an overall MOT pass rate of 65.8% across 974 real MOT tests — roughly in line with the UK average.
The most common problems on the Mercedes 709D are parking brake: efficiency below requirements (61 recorded failures), brake pipe excessively corroded (59), and service brake: efficiency below requirements (34). 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 709D owner drives around 2,389 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 709D models stay on UK roads for around 40 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.