2019 Mercedes-Benz C-Class Problems: 2 Issues Every Owner Should Know
2019 model year · 3,300+ owner reports · Updated April 2026
According to Au7o's analysis of 3,300+ owner reports, the 2019 Mercedes-Benz C-Class has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is Sunroof Drain Clog Water Damage with 1,800 owner reports. Across all issues, repair costs range from $50 to $2,500. DIY maintenance guides at au7o.io.
All 2 Known Issues
On the 2008-2020 Mercedes-Benz C-Class, the sunroof drain tubes clog with debris, causing water to back up into the headliner, A-pillars, and footwells. Prolonged leaking damages the SAM module, amplifier, and other electronics mounted under the carpet.
Common Symptoms
- Wet headliner or A-pillar trim
- Water pooling in footwells after rain
How to Fix
Clear sunroof drain tubes with compressed air or flexible wire from each corner of the sunroof tray. Clean drains preventively twice per year. If electronics are damaged, dry the area thoroughly and test all modules.
What Owners Are Using
Parts and tips from 1,800+ owners who fixed this issue
- TipClean sunroof drains every spring and fall. Pour a cup of water in each corner of the open sunroof tray and verify it exits under the car near the wheels.
On the 2015-2021 Mercedes-Benz C-Class 2.0L M274 Turbo, the M274 2.0L turbo engine develops an audible wastegate rattle at idle and low RPM due to wear in the wastegate actuator linkage. While not immediately dangerous, it worsens over time and can eventually affect boost control.
Common Symptoms
- Rattling noise at idle from turbo area
- Rattle worsens in cold weather
How to Fix
Replace the turbocharger wastegate actuator or the complete turbo assembly if linkage is excessively worn. Some dealers adjust the wastegate arm as a temporary fix.
What Owners Are Using
Parts and tips from 1,500+ owners who fixed this issue
- TipIf the rattle is mild and no boost codes are present, monitor it. Many owners live with the noise for years. Only replace if boost control is affected.