2015 Mercedes-Benz E300

The 2015 Mercedes-Benz E300 is a luxury sedan that offers a blend of comfort, performance, and technology. The E300 specifically is powered by a 2.0-liter turbocharged inline-4 engine producing 241 horsepower and 273 lb-ft of torque, paired with a 7-speed automatic transmission. Other engine options for the 2015 E-Class include a more powerful E350 with a 3.5L V6, an E400 with a 3.0L Turbo V6, and diesel powered E250 BlueTec models. Owners often praise the E300 for its smooth ride, elegant interior, and fuel efficiency. However, some common complaints include electronic glitches, maintenance costs, and occasional issues with the powertrain.

Engine

2.0L Turbocharged Inline-4 (M274)

• High-Pressure Fuel Pump Failure
  • Description/Symptoms: Difficulty starting, long cranking times, engine misfires, check engine light.
  • Solution: Replacement of the high-pressure fuel pump.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found
• Camshaft Adjuster Solenoid (Variable Valve Timing) Issues
  • Description/Symptoms: Rough idling, loss of power, check engine light.
  • Solution: Replacement of the faulty solenoid.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Transmission

7-Speed Automatic (7G-TRONIC - 722.9)

• Torque Converter Issues
  • Description/Symptoms: Shuddering or vibrations at low speeds, particularly during light acceleration.
  • Solution: Replacement of the torque converter.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found
• Valve Body Problems
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, transmission not shifting properly.
  • Solution: Replacement or rebuild of the valve body.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Suspension

• Air Suspension Failure (if equipped)
  • Description/Symptoms: Vehicle sagging on one or more corners, air compressor running constantly, “Vehicle Too Low” warning.
  • Solution: Replacement of the air struts, air compressor, or air lines.
  • Estimated Cost to Fix: $1,000 - $2,500+ per strut.
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Dead battery overnight or after short periods of inactivity, difficulty starting.
  • Solution: Diagnosis and repair of parasitic drain, which may involve replacing a faulty module or wiring harness.
  • Estimated Cost to Fix: $200 - $1,000+ (depending on the source of the drain).
  • Recalls: None Found
• Central Locking System Malfunctions
  • Description/Symptoms: Doors not locking or unlocking properly, remote key fob not working, alarm system malfunctioning.
  • Solution: Diagnosis and repair of the central locking module, door lock actuators, or wiring.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• COMAND System Issues
  • Description/Symptoms: Screen freezing or blacking out, navigation errors, Bluetooth connectivity problems, audio system malfunctions.
  • Solution: Software update, replacement of the COMAND unit.
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, making excessive noise.
  • Solution: Repair or replacement of the sunroof motor, tracks, or regulator.
  • Estimated Cost to Fix: $300 - $1,200+
  • Recalls: None Found

Interior

• Seat Heater Malfunctions
  • Description/Symptoms: Seat heaters not working, overheating, or only heating intermittently.
  • Solution: Replacement of the seat heater element or control module.
  • Estimated Cost to Fix: $300 - $800+ per seat.
  • Recalls: None Found

Summary The 2015 Mercedes-Benz E300, while a luxurious and comfortable vehicle, can be prone to some specific issues. Engine problems, especially with the high-pressure fuel pump, are a concern. Transmission issues, mainly concerning the torque converter and valve body, can be costly. Air suspension problems (if equipped) can be a significant expense. Electrical issues with the battery, central locking, and COMAND system are also relatively common. Overall, the severity of these issues ranges from moderate to serious, with repair costs potentially reaching into the thousands of dollars. Buyers should be aware of these potential problems and have the vehicle inspected by a qualified mechanic before purchasing.