What breaks most · 2006 to 2009 model years
Mercedes-Benz CLS550 problems by year
Owners have filed 62 safety complaints with NHTSA about the Mercedes-Benz CLS550 across model years 2006 to 2009. Three years stand out: 2007 for fuel system complaints, 2008 for fuel system complaints and 2006 for fuel system complaints.
- Years to check closely: 2007, 2008, 2006
- Complaints on file
- 622006 to 2009, all trims
- Worst year
- 200735 complaints
- Crashes reported
- 11 fires · 6 injuries · 0 deaths
- Typical failure mileage
- 66kMedian where owners gave mileage
- Recall campaigns
- 11Across the years shown
Complaints by model year
Raw filings with NHTSA, not adjusted for how many were sold.
| Model year | Complaints | Crashes | Recalls | Most-reported component |
|---|---|---|---|---|
| 6 | 0 | 1 | Fuel system (3) | |
| 35 | 0 | 4 | Fuel system (17) | |
| 17 | 0 | 3 | Fuel system (5) | |
| 4 | 1 | 3 | Suspension (1) |
What fails on the 2007 Mercedes-Benz CLS550
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| Fuel systemFuel pumps and injectors | 49% |
17 | 0 | Shop fuel system parts for the 2007 Mercedes-Benz CLS550 |
| Fuel systemFuel pumps and injectors | 23% |
8 | 0 | Shop fuel system parts for the 2007 Mercedes-Benz CLS550 |
| Powertrain and transmissionTransmission parts | 11% |
4 | 0 | Shop powertrain and transmission parts for the 2007 Mercedes-Benz CLS550 |
| Engine and coolingRadiators, thermostats and cooling | 6% |
2 | 0 | Shop engine and cooling parts for the 2007 Mercedes-Benz CLS550 |
| Unknown or other | 6% |
2 | 0 | — |
| SuspensionStruts, springs and control arms | 6% |
2 | 0 | Shop suspension parts for the 2007 Mercedes-Benz CLS550 |
| Electrical systemAlternators, starters and ignition | 6% |
2 | 0 | Shop electrical system parts for the 2007 Mercedes-Benz CLS550 |
| VisibilityMirrors and glass | 3% |
1 | 0 | Shop all visibility parts, not filtered to this vehicle |
One complaint can name more than one component, so shares add to more than 100%. "Unknown or other" is NHTSA's uncategorized bucket and is shown but never ranked.
In owners' words
Complaint narratives as filed with NHTSA, trimmed for length.
-
The fuel tank has a leak from a defect in the plastic, and my local Mercedes dealership is unwilling to honor the Warranty Coverage Extension that covered fuel tank components to replace the fuel tank.
-
Leaking fuel around the fuel sending unit under rear seat behind driver, filling the passenger compartment with gasoline fumes, after filling the car up with gasoline.
-
Fuel/propulsion system failed during operation on X-Way. Squeaking noise front suspension. Wheel rims cracking. Replacement key fob not working.
How to read this page
Every figure comes from the National Highway Traffic Safety Administration's public complaint database, which holds every safety-related defect complaint filed by owners since 1995. We refresh it monthly and count each complaint once per component it names. Data through September 6, 2026.
NHTSA only accepts safety-related complaints. Rattles, paint, infotainment bugs and other annoyances are under-reported here, so this page is a map of what fails in ways owners consider dangerous, not a full reliability score.
Counts are raw. Use the year-over-year shape and the component mix, not the absolute numbers. Where a component maps to parts we stock, the row links to that category filtered to the year you are viewing. Air bag and seat belt complaints link to the recall checker instead, because those repairs are almost always covered.
Common questions
Which Mercedes-Benz CLS550 years have the most problems?
By NHTSA complaint volume, 2007, 2008, 2006 carry the most filings on the Mercedes-Benz CLS550. The 2007 alone has 35 complaints, led by fuel system.
What is the most common Mercedes-Benz CLS550 problem?
On the 2007 model year, the most-reported component is fuel system with 17 complaints. The table above lists the top components for every year.
At what mileage do Mercedes-Benz CLS550 problems start?
The median mileage at failure across all Mercedes-Benz CLS550 complaints that include mileage is about 66,000 miles. Older model years skew higher; the per-year figure is in the "at a glance" card.
Are these complaints verified?
No. NHTSA publishes complaints as submitted and does not investigate individual filings. Patterns across hundreds of complaints are meaningful; a single one is not.