MERCEDES S-CLASS (2009)
Running costs, common problems, and reliability data based on 1,990 real MOT tests in 2024.
MOT Pass Rate
82%
Total Tests (2024)
1,990
Avg Mileage
114,274 mi
Est. Annual Cost
£1,900
Is the 2009 MERCEDES S-CLASS reliable?
Good reliability. Occasional issues but generally solid. That's close to the national average of 82%. It falls below the MERCEDES brand average of 87%.
At 15 years old, 82% of MERCEDES S-CLASSs from 2009 passed their MOT first time in 2024. That's based on 1,990 tests across the UK. The average mileage at this age is 114,274 miles.
How does the 2009 MERCEDES S-CLASS compare?
Mileage Analysis
The average 2009 MERCEDES S-CLASS has 114,274 miles on the clock, which is in line with the expected 111,000 miles for a 15-year-old car, suggesting normal everyday use.
Best year to buy a MERCEDES S-CLASS?
The most reliable year is the 2020 model with a 95% MOT pass rate, while the 1992 model has the lowest at 72%. The 2009 sits between the two at 82%.
How much does a 2009 MERCEDES S-CLASS cost to run?
Based on 7,400 miles/year (UK average), current fuel prices, and repair likelihood from MOT pass rate data. Insurance not included.
MERCEDES S-CLASS by Year
| Year | Pass Rate | Tests | Avg Mileage |
|---|---|---|---|
| 2021 | 91% | 164 | 32,036 mi |
| 2020 | 95% | 540 | 43,972 mi |
| 2019 | 94% | 5,921 | 67,860 mi |
| 2018 | 94% | 6,518 | 75,456 mi |
| 2017 | 93% | 5,990 | 73,988 mi |
| 2016 | 91% | 6,819 | 74,260 mi |
| 2015 | 92% | 5,513 | 87,325 mi |
| 2014 | 92% | 3,915 | 95,545 mi |
| 2013 | 89% | 2,145 | 108,065 mi |
| 2012 | 88% | 2,817 | 100,420 mi |
| 2011 | 87% | 2,202 | 117,628 mi |
| 2010 | 85% | 2,001 | 110,934 mi |
| 2009 | 82% | 1,990 | 114,274 mi |
| 2008 | 84% | 2,232 | 110,584 mi |
| 2007 | 84% | 2,940 | 117,418 mi |
| 2006 | 87% | 2,334 | 111,043 mi |
| 2005 | 84% | 1,301 | 132,014 mi |
| 2004 | 82% | 1,158 | 124,020 mi |
| 2003 | 82% | 1,227 | 120,882 mi |
| 2002 | 79% | 720 | 115,052 mi |
| 2001 | 79% | 735 | 107,381 mi |
| 2000 | 81% | 562 | 102,703 mi |
| 1999 | 78% | 434 | 98,447 mi |
| 1998 | 81% | 522 | 111,371 mi |
| 1997 | 86% | 373 | 107,182 mi |
| 1996 | 83% | 348 | 109,185 mi |
| 1995 | 86% | 286 | 111,087 mi |
| 1994 | 92% | 140 | 106,787 mi |
| 1993 | 76% | 49 | 112,335 mi |
| 1992 | 72% | 121 | 119,350 mi |
| 1991 | 92% | 118 | 120,508 mi |
| 1990 | 87% | 125 | 142,121 mi |
Checking a specific MERCEDES S-CLASS?
Enter the reg plate to see its individual MOT history, mileage verification, and predicted costs.
About the 2009 MERCEDES S-CLASS
The 2009 MERCEDES S-CLASS is a performance with a 3222cc diesel engine. 1,990 of these vehicles were MOT tested in 2024, making it a reasonably common sight on UK roads. Among all cars from 2009, the average MOT pass rate is 75%, and this model beats that benchmark.
With an average of 114,274 miles at 15 years old, MERCEDES S-CLASS owners drive about as much as the UK average.
2009 MERCEDES S-CLASS Fuel Costs
The 3222cc diesel engine is on the larger side, so fuel won't be this car's strong point. Expect around 40 mpg in mixed driving, which works out to roughly £1,245 per year at current diesel prices of 148p per litre (based on 7,400 miles per year). Diesel cars of this age should have their DPF (diesel particulate filter) checked, as replacements can be costly.
What does it cost to own a 2009 MERCEDES S-CLASS?
Total estimated annual running cost is £1,900 (£158/month), broken down as £1245 fuel, £250 road tax, £55 MOT, and £350 predicted repairs. Repair costs are moderate, reflecting the 82% pass rate. Keeping on top of servicing will help avoid surprises.
MERCEDES S-CLASS Reliability Trend
Newer MERCEDES S-CLASSs show better MOT pass rates than older ones, with an average improvement of 6 percentage points.
Buying a Used 2009 MERCEDES S-CLASS
At 15 years old, the MERCEDES S-CLASS is firmly in budget territory. Purchase prices are low, but check for rust, worn suspension bushes, and electrical gremlins. A full service history is especially valuable at this age. If you're flexible on year, the 2020 model has the highest pass rate at 95%.
Alternatives to the 2009 MERCEDES S-CLASS
The MERCEDES S-CLASS is actually the most reliable option among similar diesel performances from this era. Here are comparable diesel cars with similar engines:
- BMW 3 SERIES (2008) 80% pass rate (-2%) from 48,705 tests
- AUDI A4 (2011) 82% pass rate (same) from 26,901 tests
- AUDI A5 (2010) 82% pass rate (same) from 22,181 tests
- JAGUAR XF (2010) 80% pass rate (-2%) from 19,704 tests