AI Damage1991 Mercedes-Benz 300 Series: common problems
Owners of the 1991 Mercedes-Benz 300 Series filed 4 complaints with NHTSA, most often about electrical system and engine and cooling. Details by component below, with sources.
Key figures
- Owner complaints
- 4
What fails most often
- 1 Electrical system 50% of all complaints
- 2 Engine and cooling 50% of all complaints
- 3 Vehicle speed control 50% of all complaints
- 4 Exterior lighting 25% of all complaints
- 5 Powertrain 25% of all complaints
- 6 Seats 25% of all complaints
- 7 Service brakes 25% of all complaints
- 8 Suspension 25% of all complaints
- Electrical system: 2 complaints (50% of all).
- Engine and cooling: 2 complaints (50% of all).
- Vehicle speed control: 2 complaints (50% of all).
- Exterior lighting: 1 complaints (25% of all).
- Powertrain: 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 |
| Engine and cooling | 2 | 0 | 0 |
| Vehicle speed control | 2 | 0 | 0 |
| Exterior lighting | 1 | 0 | 0 |
| Powertrain | 1 | 0 | 0 |
| Seats | 1 | 0 | 0 |
| Service brakes | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
| Visibility | 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.
Dt: consumer states his wife was coming home from work on the highway and the accelerator quit working. She then had to cross lanes to pull off the road without power. The consumer found online that there was recall, nhtsa campaign 93v095000.
Wiring in engine compartment and all rubber hoses on the vacuum system have deteriorated .the wiring connectors have all fell apart and the hoses have turned hard and fell apart.
Formanic transfer case failed, was replaced at 42718 miles, formanic light came on, had transfer case replaced a second time on 1/10/01 at 84,000 miles, however, failed to work properly, failure of internal bearings, caused a loss of steering and braking power.
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 300 Series has 9 complaints (6 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.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Vehicle speed control. Accelerator pedal, cruise control, throttle codes.
- 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 1991 Mercedes-Benz 300 Series?
Owner complaints to NHTSA most often mention: electrical system, engine and cooling, vehicle speed control. Total complaints: 4. The most frequent symptoms in complaint texts: headlights and tail lights (25%), knocking, grinding or other noise (25%), steering or power steering problems (25%).
How many service bulletins (TSB) were issued for the 1991 Mercedes-Benz 300 Series?
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 1991 Mercedes-Benz 300 Series 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 1991 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.