AI Damage2003 Mercedes-Benz S 500: common problems
Owners of the 2003 Mercedes-Benz S 500 filed 10 complaints with NHTSA, most often about seat belts and electrical system. Details by component below, with sources.
Key figures
- Owner complaints
- 10
What fails most often
- 1 Seat belts 40% of all complaints
- 2 Electrical system 20% of all complaints
- 3 Engine and cooling 10% of all complaints
- 4 Equipment 10% of all complaints
- 5 Exterior lighting 10% of all complaints
- 6 Powertrain 10% of all complaints
- 7 Service brakes 10% of all complaints
- 8 Suspension 10% of all complaints
- Seat belts: 4 complaints (40% of all).
- Electrical system: 2 complaints (20% of all).
- Engine and cooling: 1 complaints (10% of all).
- Equipment: 1 complaints (10% of all).
- Exterior lighting: 1 complaints (10% of all).
Symptoms owners describe
How many of the 10 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Seat belts | 4 | 0 | 0 |
| Electrical system | 2 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Equipment | 1 | 0 | 0 |
| Exterior lighting | 1 | 0 | 0 |
| Powertrain | 1 | 0 | 0 |
| Service brakes | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
During hot weather the seat belt gets stuck and you will not be able to use the seat belt at all. This is a safety issue and should not happen. This happens when the car is parked under hot weather. This is in the drivers side. This has been happening for the last 1 year.
The passenger front seat belt will not retract. Also, the dashboard lights went out while driving making it very hard to see speed/fuel/gear selection. These are both safety concerns that should be recalled. We can send you a picture of the dead dash if needed. Also video of a stuck seat belt. Thanks, kurt.
Tl* the contact owns a 2003 mercedes benz s500. While attempting to making a right or left turn, an abnormal noise was heard on the front passenger side of the vehicle. The failure was persistent. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure.
Tl* the contact owns a 2003 mercedes benz s500. The contact stated that while driving at 45 mph, the speedometer lights flashed and there was an abnormal burning odor coming from the front panel. The vehicle was not diagnosed or repaired. The contact stated he was mechanic and the instrument cluster failed.
The contact stated that the front passenger side seat belt failed to retract. During warmer outside temperatures, the failure would worsen. The failure occurred multiple times. The dealer was unable to duplicate the failure. The vehicle was not repaired and the manufacturer was notified.
Special acquisition module (sam) my car would not start the mercedes roadside came out and started the car and I took it to the dealership for diagnostic. Upon review the dealer stated the sam module plastic cover had water drops on it.
The owner later took the vehicle to the dealer and was told that this occurred with all brands of cars not just mercedes and that a certain percentage of brake failures is acceptable in the auto industry so long as that percentage does not get too high.
The consumer took the vehicle to the manufacturer for final repairs, however the problem still existed on with air conditioner. Nar
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 10,921 of 36,656 model years in the NHTSA data (top 30% most complained about).
On average one model year of the S 500 has 11 complaints (16 years in the data). This year has 10, about average.
What to check before buying
- Seat belts. Belt pretensioners after airbag deployment, SRS codes.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
Other years of this model
Questions and answers
What are the most common problems with the 2003 Mercedes-Benz S 500?
Owner complaints to NHTSA most often mention: seat belts, electrical system, engine and cooling. Total complaints: 10. The most frequent symptoms in complaint texts: seat belts (40%), brake failure (10%), A/C or heater (10%).
How many service bulletins (TSB) were issued for the 2003 Mercedes-Benz S 500?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2003 Mercedes-Benz S 500 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2003 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.