AI Damage2004 Mercedes-Benz SL Class: common problems
Owners of the 2004 Mercedes-Benz SL Class filed 3 complaints with NHTSA, most often about service brakes and equipment. Details by component below, with sources.
Key figures
- Owner complaints
- 3
What fails most often
- 1 Service brakes 67% of all complaints
- 2 Equipment 33% of all complaints
- 3 Exterior lighting 33% of all complaints
- 4 Structure 33% of all complaints
- 5 Suspension 33% of all complaints
- Service brakes: 2 complaints (67% of all).
- Equipment: 1 complaints (33% of all).
- Exterior lighting: 1 complaints (33% of all).
- Structure: 1 complaints (33% of all).
- Suspension: 1 complaints (33% of all).
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 5 L · petrol · 8 cyl
- 5.4 L · petrol · turbo · 8 cyl
- 5.5 L · petrol · turbo · 12 cyl
- automatic, 5-speed
- automatic, 7-speed
Drive: RWD
Symptoms owners describe
How many of the 3 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) |
|---|---|---|---|
| Service brakes | 2 | 0 | 0 |
| Equipment | 1 | 0 | 0 |
| Exterior lighting | 1 | 0 | 0 |
| Structure | 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.
Something called an abc pump and block has failed and car drops down on frame. Spent $3200 on the pump to drive 2 months before they want $3800 to repair the valve block. Both times the vehicle drops and is dangerous to drive.
When turning on the air conditioner or any other vehicle accessory the headlights dim or they flash on and off as if going from high beam to low beam, etc. Technical service bulletin 040842001a.
Recall campaign: recall 2004 050014 notice received for defective sensotronic brake. The service dealer computers disengaged the consumers braking system, therefore the vehicle was inoperable. 2004 mercedes benz sl500 roadster.
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 17,150 of 36,656 model years in the NHTSA data (top 47% most complained about).
On average one model year of the SL Class has 4 complaints (7 years in the data). This year has 3, below average.
What to check before buying
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Suspension. Wheel alignment, control arms, subframe, even tire wear.
Other years of this model
Questions and answers
What are the most common problems with the 2004 Mercedes-Benz SL Class?
Owner complaints to NHTSA most often mention: service brakes, equipment, exterior lighting. Total complaints: 3. The most frequent symptoms in complaint texts: A/C or heater (33%), headlights and tail lights (33%).
How many service bulletins (TSB) were issued for the 2004 Mercedes-Benz SL Class?
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 2004 Mercedes-Benz SL Class 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 2004 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.