AI Damage2004 Mercedes-Benz SLK230: common problems
Owners of the 2004 Mercedes-Benz SLK230 filed 4 complaints with NHTSA, most often about electrical system and exterior lighting. Details by component below, with sources.
Key figures
- Owner complaints
- 4
What fails most often
- 1 Electrical system 50% of all complaints
- 2 Exterior lighting 50% of all complaints
- 3 Engine and cooling 25% of all complaints
- 4 Equipment 25% of all complaints
- Electrical system: 2 complaints (50% of all).
- Exterior lighting: 2 complaints (50% of all).
- Engine and cooling: 1 complaints (25% of all).
- Equipment: 1 complaints (25% of all).
Symptoms owners describe
How many of the 4 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 | 2 | 0 | 0 |
| Exterior lighting | 2 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Equipment | 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.
Bought car with 60000 miles and after 3 years right side rear brake light stopped working. Replaced bulb and adapter but also had to bend adapter connector prongs for better contact. Six months later same problem and replaced whole right side unit. Some time later same problem with other side.
The contact stated that while at a light, the abs warning light illuminated. The vehicle was not repaired and the manufacturer was notified. The contact also stated that her vehicle was previously repaired under a manufacturer's recall pertaining to the same issue. The approximate failure mileage was 160,000.
Vin [xxx] had the engine control module me-sfi malfunction indicator lamp "check engine light" came on and was diagnosed at the beverly hills mercedes benz dealership with misfiring in the engine (due to the camshaft solenoid and the mass alrflow senor (o2 senor) was damaged, with a major oil leak.
The new high-intensity headlights, that are bluish in color, are extraordinarily blinding. This headlight, obviously, should have never been approved, and never used. Perhaps it is an improvement to the drivers that use the bluish headlights, but it is a safety hazard to oncoming automobiles.
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 15,521 of 36,656 model years in the NHTSA data (top 42% most complained about).
On average one model year of the SLK230 has 23 complaints (7 years in the data). This year has 4, below 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.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
Other years of this model
Questions and answers
What are the most common problems with the 2004 Mercedes-Benz SLK230?
Owner complaints to NHTSA most often mention: electrical system, exterior lighting, engine and cooling. Total complaints: 4. The most frequent symptoms in complaint texts: warning lights, check engine (50%), headlights and tail lights (25%), oil leak or consumption (25%).
How many service bulletins (TSB) were issued for the 2004 Mercedes-Benz SLK230?
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 SLK230 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.