2014 Mercedes-Benz E250

The 2014 Mercedes-Benz E250 Bluetec is a diesel-powered luxury sedan known for its fuel efficiency and comfortable ride. It came standard with a 2.1-liter turbocharged four-cylinder diesel engine producing 195 horsepower and 369 lb-ft of torque, paired with a 7-speed automatic transmission (7G-Tronic Plus). Other engine options for the 2014 E-Class include gasoline-powered four-cylinder, V6, and V8 engines. Some owners praise its fuel economy, luxurious interior, and smooth ride, while others have noted issues related to the diesel emissions system and some electrical components.

Engine

2.1L Turbo Diesel (OM651) - E250 Bluetec

• Diesel Particulate Filter (DPF) Clogging
  • Description/Symptoms: Reduced engine power, warning lights on the dashboard (e.g., check engine light), frequent regeneration cycles, and eventual DPF failure.
  • Solution: Forced regeneration of the DPF, replacement of the DPF, or cleaning of the DPF.
  • Estimated Cost to Fix: $300-$2000+ depending on the solution.
  • Recalls: None Found
• AdBlue (Diesel Exhaust Fluid) System Issues
  • Description/Symptoms: Warning lights related to AdBlue, “Check Engine” light illuminated, potential limp mode activation, and failure of components such as the AdBlue injector or pump.
  • Solution: Replacement of faulty AdBlue system components (injector, pump, level sensor, etc.), system flush, or software update.
  • Estimated Cost to Fix: $200-$1500+
  • Recalls: None Found
• Fuel Injector Failure
  • Description/Symptoms: Rough idling, misfires, reduced fuel economy, black smoke from the exhaust, and difficulty starting the engine.
  • Solution: Replacement of the faulty fuel injector(s).
  • Estimated Cost to Fix: $300 - $1000+ per injector.
  • Recalls: None Found

Transmission

7G-Tronic Plus (722.9)

• Torque Converter Issues
  • Description/Symptoms: Shuddering during gear changes, slipping between gears, and rough shifting.
  • Solution: Replacement of the torque converter.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Hard shifting, delayed engagement, slipping, erratic shifting behavior, and failure to shift into certain gears.
  • Solution: Replacement or rebuild of the valve body.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found

Suspension

• Air Suspension Failure (If Equipped)
  • Description/Symptoms: Vehicle sagging or leaning to one side, failure of the air compressor, warning lights on the dashboard, and a rough or bouncy ride.
  • Solution: Replacement of the air struts, air compressor, or other components of the air suspension system (e.g., valve block, air lines).
  • Estimated Cost to Fix: $800 - $2,500+ per strut/component.
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Dead battery, difficulty starting the car, and the need for frequent jump-starts.
  • Solution: Diagnosis and repair of the parasitic drain source, replacement of the battery.
  • Estimated Cost to Fix: $150 - $500+
  • Recalls: None Found
• Electronic Control Unit (ECU) Issues
  • Description/Symptoms: Intermittent electrical problems, warning lights on the dashboard, issues with engine performance, and communication errors.
  • Solution: Diagnosis and reprogramming or replacement of the ECU.
  • Estimated Cost to Fix: $500-$1500+
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, unusual noises during operation, and water leaks.
  • Solution: Repair or replacement of the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found

Interior

• Command System Malfunctions
  • Description/Symptoms: System freezing, unresponsive buttons, screen flickering, navigation problems, and audio issues.
  • Solution: Software update, replacement of the head unit, or repair of the wiring harness.
  • Estimated Cost to Fix: $300-$1500+
  • Recalls: None Found

Summary

The 2014 Mercedes-Benz E250 Bluetec, while generally a reliable and comfortable vehicle, can suffer from issues related to its diesel emissions system and some electrical components. The DPF clogging and AdBlue system problems are common and can be expensive to repair. Transmission issues and electrical gremlins can also surface. Severity ranges from minor inconveniences to more serious mechanical failures that can lead to high repair bills. Potential buyers should be aware of these potential issues and thoroughly inspect the vehicle before purchase, particularly focusing on the diesel emissions system, transmission, and electrical functionality.