AI Damage2003 Mercedes-Benz SLK: common problems
Owners of the 2003 Mercedes-Benz SLK filed 9 complaints with NHTSA, most often about electrical system and exterior lighting. Details by component below, with sources.
Key figures
- Owner complaints
- 9
What fails most often
- 1 Electrical system 33% of all complaints
- 2 Exterior lighting 22% of all complaints
- 3 Visibility 22% of all complaints
- 4 Electronic stability control 11% of all complaints
- 5 Equipment 11% of all complaints
- 6 Service brakes 11% of all complaints
- 7 Steering 11% of all complaints
- Electrical system: 3 complaints (33% of all).
- Exterior lighting: 2 complaints (22% of all).
- Visibility: 2 complaints (22% of all).
- Electronic stability control: 1 complaints (11% of all).
- Equipment: 1 complaints (11% of all).
Engines and transmissions
US-market versions per EPA. On the right: how many NHTSA complaints name this engine or transmission type.
- 2.3 L · petrol · 4 cyl
- 3.2 L · petrol · 6 cyl
- automatic, 5-speed
- manual, 6-speed
Drive: RWD
Symptoms owners describe
How many of the 9 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) |
|---|---|---|---|
| Electrical system | 3 | 0 | 0 |
| Exterior lighting | 2 | 0 | 0 |
| Visibility | 2 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Equipment | 1 | 0 | 0 |
| Service brakes | 1 | 0 | 0 |
| Steering | 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.
After the car brakes to the right for a couple of second the bas/esp light comes on . I have had this happen on the highway at 60 mph (very scary). I have since had the brake switch changed , and wheel sensors and new battery.
2003 slk 230 tail light still defective after recall repair was performed.
Tl* the contact owns a 2003 mercedes slk320 ( n/a). While driving at various speeds , the vehicle loses power without any warning and after the vehicle loses power all the lights illuminates on the instrument panel. The vehicle was towed to his residence.this has occurred 10 additional times.
The mirror contained a fluid which leaked out causing the self-dimming mirror to fail to provide dimming against rear approaching headlights resulting in the driver to either be blinded or to have to turn the mirror away which greatly eliminates rear view capability in the interior.
The interior rearview mirror in a 2003 mercedes benz slk230 (r170) had a fluid leak. The mirror is supposed to be a chromatic auto-dimming device. Due to the fluid leak all of the darkening agent has migrated to the center of the mirror.
Mercedes with 23,000 ignition switch will not turn. I reported the issue of intermittent problem to dealer and attempted to have it resolved while under extended warranty period. The dealer said it had not failed. Well, the warranty is gone and the failing part failed.
I inserted the key in the ignition switch and was unable to turn the key or remove the key and the car would not start. I was left stranded in a bad section of town and had to wait for flat bed to take the car to the dealership.
Subsequently both my tail lights are not functioning and causing safety hazard. Dealerships contacted have no information from mbusa on how to correct the defective parts affected in the recall.
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 11,368 of 36,659 model years in the NHTSA data (top 31% most complained about).
On average one model year of the SLK has 8 complaints (9 years in the data). This year has 9, about average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
- Visibility. Wipers, mirrors, defrosters, cracked glass.
- Electronic stability control. ABS/ESC sensors, steering angle, codes after suspension repair.
Other years of this model
Questions and answers
What are the most common problems with the 2003 Mercedes-Benz SLK?
Owner complaints to NHTSA most often mention: electrical system, exterior lighting, visibility. Total complaints: 9. The most frequent symptoms in complaint texts: headlights and tail lights (33%), won't start (11%), steering or power steering problems (11%).
How many service bulletins (TSB) were issued for the 2003 Mercedes-Benz SLK?
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 SLK 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 2026-11-06.