2009 Mercedes-Benz E550

The 2009 Mercedes-Benz E550 is a luxury sedan known for its powerful engine and comfortable ride. It came standard with a 5.5L V8 engine producing 382 horsepower and 391 lb-ft of torque, paired with a 7-speed automatic transmission (7G-Tronic). While praised for its performance and luxurious features, some owners have reported specific issues. Common likes include the powerful engine, smooth ride, and elegant interior. Dislikes often revolve around maintenance costs and some electrical issues.

Engine

5.5L M273 V8

• Camshaft Adjuster Solenoid Failure
  • Description/Symptoms: Check engine light, rough idle, decreased engine performance, and a ticking noise from the engine.
  • Solution: Replacement of the faulty camshaft adjuster solenoid(s).
  • Estimated Cost to Fix: $200 - $500+ per solenoid
  • Recalls: None Found
• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks around the valve cover, burning oil smell, and potentially low oil levels.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found
• Oil Filter Housing Gasket Leaks
  • Description/Symptoms: Oil leaks around the oil filter housing, burning oil smell, and potentially low oil levels.
  • Solution: Replacement of the oil filter housing gasket.
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found

Transmission

7G-Tronic (722.9) 7-Speed Automatic

• Conductor Plate Failure
  • Description/Symptoms: Erratic shifting, transmission slipping, getting stuck in a gear, or failing to shift altogether.
  • Solution: Replacement of the conductor plate within the transmission.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering during acceleration, especially at lower speeds, or a complete failure to engage gears.
  • Solution: Replacement of the torque converter.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

Suspension

• Airmatic Air Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, compressor running constantly, “Visit Workshop” message on the instrument cluster.
  • Solution: Diagnosis to determine the source of the leak (air strut, compressor, valve block, or lines). Replacement of the faulty component.
  • Estimated Cost to Fix: Air struts: $800 - $2000+ per strut; Compressor: $500 - $1200+
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, inability to start the car, steering wheel not unlocking.
  • Solution: Replacement of the EIS module and potentially reprogramming.
  • Estimated Cost to Fix: $800 - $2000+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: Various electrical malfunctions such as lights not working, wipers malfunctioning, or other electronic components failing.
  • Solution: Diagnosis to determine the faulty SAM module (front or rear). Replacement and reprogramming of the module.
  • Estimated Cost to Fix: $500 - $1500+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Dead battery, difficulty starting the car, needing to jump-start frequently.
  • Solution: Diagnosis to identify the source of the parasitic draw (e.g., faulty module, improperly installed aftermarket equipment). Repair or replacement of the faulty component.
  • Estimated Cost to Fix: Varies widely depending on the cause, can range from $100 to $1000+
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof jamming, not opening or closing properly, excessive noise during operation.
  • Solution: Cleaning and lubrication of the sunroof tracks. Possible replacement of the sunroof motor or damaged components.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Interior

• Center Console Buttons Malfunctioning
  • Description/Symptoms: Buttons for the radio, climate control, or other functions not responding or working intermittently.
  • Solution: Replacement of the affected button panel or the entire center console unit.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found

Summary

The 2009 Mercedes-Benz E550, while a luxurious and powerful vehicle, can present owners with several potential issues. The most concerning are the Airmatic suspension failures and electrical problems, as these can be costly to repair. Engine and transmission issues, while also expensive, are less frequent but still important to be aware of. Overall, potential buyers should factor in the cost of potential repairs and maintenance when considering this model. While some issues may be minor, others can be severe and impact the vehicle’s reliability.