2021 Mercedes-Benz C-Class Pre-Purchase Inspection Checklist
Known Issues — 2021 Mercedes-Benz C-Class
MODERATE
Oil consumption in 2.0L turbo engine
MODERATE
9G-Tronic transmission rough low-speed shifts
MODERATE
C63 AMG catalytic converter codes at higher mileage
MODERATE
Sunroof water ingress from clogged drain tubes
MINOR
COMAND system map data becoming outdated
CRITICAL
Rear air spring failure in air suspension equipped models
What to Inspect
- Check rear ride height for air suspension sag (if equipped)
- Verify oil level and service history for consumption tracking
- Test transmission behavior at low speeds in traffic
- Inspect sunroof seals and drainage channels
- Check for check engine codes, especially catalyst efficiency codes
- Confirm COMAND infotainment functions including navigation
Expected Maintenance Costs
| Service | Interval | Cost |
|---|---|---|
| Service A (oil & filter) | every 10,000 miles | $280-$400 |
| Service B (full inspection) | every 20,000 miles | $550-$800 |
| Spark plugs replacement | every 60,000 miles | $300-$500 |
| Transmission fluid service | every 40,000 miles | $350-$500 |
| Brake pads and rotors (front) | every 25,000-35,000 miles | $700-$1,100 |
| Air spring replacement (each) | as needed | $800-$1,400 |
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