2008 Mercedes Benz S550 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
19 owner complaints analyzed
0 distinct recall campaigns
70,000 mi median reported failure mileage
Scope: 2008 model year. Data snapshot: . 15 complaints include usable failure mileage.
Most common problems
Electrical System is the most frequently named component, appearing in 4 of 19 complaints (21.1%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Electrical and battery issues | 4 | 21.1% |
| Engine operation | 2 | 10.5% |
| Braking behavior | 2 | 10.5% |
| Transmission and shifting | 1 | 5.3% |
| Fuel system concerns | 1 | 5.3% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Electrical System | 4 |
| Tires | 4 |
| Engine | 2 |
| Fuel System, Gasoline | 2 |
| Power Train | 2 |
| Suspension | 2 |
| Air Bags | 1 |
| Equipment | 1 |
Electrical System: 4; Tires: 4; Engine: 2; Fuel System, Gasoline: 2; Power Train: 2; Suspension: 2; Air Bags: 1; Equipment: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 1 |
| 25,000 to 49,999 | 2 |
| 50,000 to 74,999 | 5 |
| 75,000 to 99,999 | 4 |
| 100,000 to 149,999 | 2 |
| 150,000 and above | 1 |
Under 25,000: 1; 25,000 to 49,999: 2; 50,000 to 74,999: 5; 75,000 to 99,999: 4; 100,000 to 149,999: 2; 150,000 and above: 1
50,000 to 74,999 miles has the most reports with usable mileage (5). 4 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2009 | 2 |
| 2011 | 1 |
| 2013 | 3 |
| 2014 | 1 |
| 2015 | 2 |
| 2017 | 1 |
| 2018 | 1 |
| 2019 | 1 |
| 2020 | 3 |
| 2023 | 2 |
| 2024 | 1 |
| 2025 | 1 |
2009: 2; 2011: 1; 2013: 3; 2014: 1; 2015: 2; 2017: 1; 2018: 1; 2019: 1; 2020: 3; 2023: 2; 2024: 1; 2025: 1
Pattern summary
Electrical System leads the component reports. Electrical and battery issues appears in 4 complaint narratives. Engine operation appears in 2 complaint narratives. Braking behavior appears in 2 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11324288 · 2020-05-12 (May 12, 2020)
P-RC-200808004 BODY CONTROL ACCELERATION SENSORS...MODELS 2001-2008 11/4/2008 - 200807001 RE-CODE THE SOFTWARE CALIBRATION NUMBER (SCN) 11/04/2008 - 200803005 REPLACE FRONT SAM S-SC-2012070002 RETROFIT ADAPTER WIRING HARNESS ON CAMSHAFT ADUSTMENT SOLEN…
Owner-reported narrative. 148,000 miles reported. Look up ODI 11324288 at NHTSA ↗
Owner report 11329607 · 2020-06-18 (June 18, 2020)
TL* THE CONTACT OWNS A 2008 MERCEDES-BENZ S550. THE CONTACT STATED THAT WHILE STOPPED, THE VEHICLE WAS SUDDENLY REAR-ENDED CAUSING THE VEHICLE'S DRIVER AND PASSENGER FRONT SEAT HEAD REST AIR BAGS TO DEPLOY. THE CONTACT STATED THAT HE SUSTAINED BROKEN BONES IN HIS NECK AS WELL AS INJURIES TO HIS LEFT ELBOW AND BACK AREA. THE FRONT PASSENGER RECEIVED INJURIES TO HIS NECK AND BACK AREA AND WAS TRANSPORTED THE HOSPITAL BY AMBULANCE WHILE THE DRIVER DROVE HIS VEHICLE TO THE HOSPITAL. A POLICE REPORT WAS FILED. THE VEHICLE WAS TAKEN TO A LOCAL A BODY…
Owner-reported narrative. 78,013 miles reported. Look up ODI 11329607 at NHTSA ↗
Owner report 10408926 · 2011-06-26 (June 26, 2011)
CAR STALLED WHILE DRIVING ON 10 FWY GOING FROM AZ TO CALIF. WOULD NOT RESTART & WAS TOWED TO PALM SPRINGS MBZ. NOT OPEN TIL MON 27TH. *TR
Owner-reported narrative. 41,000 miles reported. Look up ODI 10408926 at NHTSA ↗
Owner report 11659570 · 2025-05-07 (May 7, 2025)
I’m reporting a serious safety issue with the balance shaft sprocket in my Mercedes-Benz S550 (M273 engine, 273.968). This is a known defect that causes the sprocket to wear out far too early due to poor material design. When it wears, it throws off the engine timing, leading to check engine lights, rough idling, reduced power, and even stalling. In some cases, the engine can shut down while driving, which is a major safety risk. Thousands of people have experienced this exact problem, and it’s all over Mercedes forums, Reddit, and technical b…
Owner-reported narrative. Look up ODI 11659570 at NHTSA ↗
Owner report 10255933 · 2009-01-21 (January 21, 2009)
I HAVE 2008 MERCEDES S550. THE CAR SUDDENLY STARTED MAKING NOISE IN THE FRONT AND I CALLED DEALERSHIP. THEY TOLD ME THE BRAKES ARE GONE AND EVEN ROTORS ARE DAMAGED. I HAD NO INDICATION ALL THIS TIME I WAS DRIVING THAT THE CAR HAD NO BRAKES AS NO BRAKELIGHTS CAME ON. TILL THE TIME I WENT TO DEALERSHIP NO INDICATION CAME AS SENSORS ARE NOT WORKING. IS IT NOT UNSAFE TO BE DRIVING ON THE HIGHWAY 60 TO 70 MILES /HR WITH NO BREAK SENSORS . I CALLED MERC AND THE TOP TWO PEOPLE ROBYN AND TIM IN ESCALATION DEPT TELL ME AT FIRST THEY ARE PICKING UP THE. …
Owner-reported narrative. Look up ODI 10255933 at NHTSA ↗
Owner report 10502393 · 2013-03-11 (March 11, 2013)
MERCEDES BENZ, S550, 4MATIC, 2008. I WAS STOPPED AT A RED LIGHT. WHEN THE LIGHT TURNED GREEN AND I WAS MOVING FORWARD AT ABOUT 15-20 MILES PER HOUR, THE CAR CAME TO A SUDDEN STOP. THE VEHICLE BEHIND ME ALMOST RAN INTO MY BACK SINCE THERE WERE NO BRAKE LIGHTS ILLUMINATED WHEN THIS UNFORTUNATE MALFUNCTION TOOK PLACE. I IMMEDIATELY LOOKED THE CONTROL PANEL FOR ANY MALFUNCTION ALARM AND THERE WERE NONE. THE ROOT CAUSE OF THE PROBLEM WAS FRONT DIFFERENTIAL SEIZE UP WITHOUT ANY WARNING. THERE WERE THE RIGHT AMOUNT OF OIL IN THE RESERVOIR SO TH…
Owner-reported narrative. 101,300 miles reported. Look up ODI 10502393 at NHTSA ↗
Owner report 11541256 · 2023-08-28 (August 28, 2023)
The contact owns a 2008 Mercedes-Benz S550. The contact stated while driving 35-40 MPH, the message "SAFETY" was temporarily displayed on the instrument panel. Additionally, the contact stated while starting the vehicle on several occasions, the message " SAFETY " was displayed on the infotainment system screen. The check engine warning light was illuminated, and the messages "Active Head Lamp Inoperative" and "Service Required. Do Not Shift Gears" were displayed. The contact also stated that upon shifting into drive (D), the gear shift indicat…
Owner-reported narrative. 176,310 miles reported. Look up ODI 11541256 at NHTSA ↗
Owner report 10956010 · 2017-02-21 (February 21, 2017)
TL* THE CONTACT OWNS A 2008 MERCEDES BENZ S550. THE CONTACT STATED THAT THE VEHICLE HAD EXPERIENCED AN ABNORMAL FUEL ODOR. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE FUEL TANK WAS FRACTURED AND NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED DUE TO THE PART BEING ON BACK ORDER. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE CONTACT HAD REFERENCED NHTSA CAMPAIGN: 12V557000(FUEL SYSTEM, GASOLINE) AS A POSSIBLE SOLUTION TO THE FAILURE HOWEVER THE VIN WAS NOT INCLUDED. THE FAILURE MILEAGE WAS APPROXIMATELY 91,000.
Owner-reported narrative. 91,000 miles reported. Look up ODI 10956010 at NHTSA ↗