2021 Mercedes-Benz E300

The 2021 Mercedes-Benz E300 is a luxury sedan known for its refined ride, elegant interior, and advanced technology. The E300 is powered by a 2.0-liter turbocharged inline-4 engine producing 255 horsepower and 273 lb-ft of torque, paired with a 9G-TRONIC 9-speed automatic transmission. Other engine options for the 2021 E-Class include the E350 (similar 2.0L engine with mild-hybrid), the E450 (3.0L inline-6 turbo with mild-hybrid), and AMG variants with more powerful engines. Drivers appreciate the E300’s comfortable and quiet cabin, smooth ride, and user-friendly infotainment system. Common complaints include the complicated nature of some technology features, the cost of maintenance, and occasional minor electrical glitches.

Electrical

• MBUX Infotainment System Freezing/Crashing
  • Description/Symptoms: The Mercedes-Benz User Experience (MBUX) system can freeze, become unresponsive, or crash completely, requiring a restart of the vehicle or system. This can affect navigation, media, and climate control.
  • Solution: Software update from the dealership. Sometimes a system reset can temporarily fix the issue.
  • Estimated Cost to Fix: Software updates are typically covered under warranty. Out of warranty, a diagnostic fee may apply ($150 - $300+).
  • Recalls: None Found
• Sensor Malfunctions (Parking Sensors, Blind Spot Monitoring)
  • Description/Symptoms: Parking sensors may give false warnings or fail to detect objects. Blind spot monitoring may become intermittent or stop working altogether.
  • Solution: Diagnose the specific sensor causing the issue. Replacement of the faulty sensor. Recalibration of the sensor system.
  • Estimated Cost to Fix: $200 - $800+ depending on the sensor and labor.
  • Recalls: None Found

Interior

• Sunroof Rattling/Squeaking
  • Description/Symptoms: Rattling or squeaking noises coming from the sunroof area, especially when driving over uneven surfaces.
  • Solution: Inspect and lubricate the sunroof tracks and seals. Tighten any loose components. In some cases, replacement of the sunroof seal or components may be necessary.
  • Estimated Cost to Fix: $100 - $500+ depending on the severity and required repairs.
  • Recalls: None Found
• Trim Pieces Coming Loose
  • Description/Symptoms: Interior trim pieces, particularly around the dashboard, door panels, and center console, may become loose or detached.
  • Solution: Reattach the trim pieces using appropriate clips or adhesives. If clips are broken, they should be replaced.
  • Estimated Cost to Fix: $50 - $300+ depending on the extent of the damage and labor.
  • Recalls: None Found

Exterior

• Automatic High Beam Assist Malfunction
  • Description/Symptoms: The automatic high beam assist feature may not function correctly, either failing to activate or inappropriately activating in the presence of other vehicles.
  • Solution: Recalibration of the system. Inspection of the camera and sensors. Replacement of faulty components if necessary.
  • Estimated Cost to Fix: $100 - $400+ depending on the diagnostic and repair.
  • Recalls: None Found

Suspension

• Air Suspension Issues (If Equipped)
  • Description/Symptoms: If equipped with the optional air suspension, owners may experience issues with the system deflating overnight, ride height fluctuations, or compressor failure.
  • Solution: Diagnose the source of the leak (air struts, air lines, or compressor). Replace faulty components.
  • Estimated Cost to Fix: $800 - $3000+ depending on the component and labor. Air struts are particularly expensive.
  • Recalls: None Found

Engine

2.0L Turbocharged Inline-4

• “Check Engine Light” Related to Fuel Injectors
  • Description/Symptoms: “Check Engine Light” may illuminate. Rough idling, misfires, reduced power. OBD code indicates a fuel injector issue.
  • Solution: Diagnose which fuel injector is failing. Replacement of the faulty fuel injector(s).
  • Estimated Cost to Fix: $300 - $800+ depending on how many injectors need replacement and labor costs.
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic

• Hesitation or Jerking During Shifting
  • Description/Symptoms: Hesitation or jerking during shifts, particularly at lower speeds. The transmission may feel rough or unresponsive.
  • Solution: Software update to the transmission control module (TCM). In some cases, a transmission flush may help. If the issue persists, valve body replacement may be necessary.
  • Estimated Cost to Fix: Software update (covered under warranty, otherwise $100-$300). Transmission flush ($250-$500). Valve body replacement ($1500-$3000+).
  • Recalls: None Found

Summary:

The 2021 Mercedes-Benz E300, while a luxurious and well-regarded vehicle, does have some common issues. Electrical glitches with the MBUX system and sensors are frequent complaints, along with interior noises. Suspension problems, particularly with the optional air suspension, can be costly to repair. Engine and transmission issues, while less common, can also lead to expenses. Overall, while most issues are relatively minor, some can be costly to fix, especially if they involve the air suspension or transmission.