2011 Mercedes-Benz S400

Introduction: The 2011 Mercedes-Benz S400 is a luxury sedan powered by a 3.0-liter V6 engine producing 302 horsepower and 339 lb-ft of torque. It comes with a 7-speed automatic transmission. The S400 is praised for its comfortable ride, refined interior, and advanced technology features. However, it has also received criticism for its high price tag and some reliability issues.

Engine

3.0L V6

• Intake manifold gasket failure: Symptoms include oil leaks and reduced engine power. Solution: Replace the intake manifold gasket. Estimated Cost to Fix: $500 - $1,000
• Timing chain tensioner failure: Symptoms include rattling noises on startup and poor engine performance. Solution: Replace the timing chain tensioner. Estimated Cost to Fix: $1,000 - $2,000
• Fuel injector failure: Symptoms include rough idling, engine misfires, and reduced fuel economy. Solution: Replace the failed fuel injector(s). Estimated Cost to Fix: $300 - $500 per injector

Transmission

7-Speed Automatic

• Transmission valve body failure: Symptoms include delayed or rough shifting, slipping, and loss of power. Solution: Replace the transmission valve body. Estimated Cost to Fix: $2,000 - $3,000
• Torque converter failure: Symptoms include shuddering, slipping, and overheating. Solution: Replace the torque converter. Estimated Cost to Fix: $1,500 - $2,500
• Transmission fluid leaks: Symptoms include low transmission fluid levels and visible leaks. Solution: Repair or replace the leaking component(s). Estimated Cost to Fix: $300 - $600+

Suspension

• Air suspension compressor failure: Symptoms include a lowered ride height, rough ride, and warning lights. Solution: Replace the air suspension compressor. Estimated Cost to Fix: $1,000 - $2,000
• Air strut failure: Symptoms include uneven ride height, suspension noises, and warning lights. Solution: Replace the failed air strut(s). Estimated Cost to Fix: $800 - $1,500 per strut

Electrical

• Battery drain: Symptoms include a dead battery after sitting for a period of time. Solution: Diagnose and repair the source of the parasitic drain. Estimated Cost to Fix: $200 - $500
• Electrical system malfunction: Symptoms may vary depending on the specific component affected, but can include warning lights, electrical failures, and engine issues. Solution: Diagnose and repair the faulty component(s). Estimated Cost to Fix: $300 - $1,000+

Exterior

• Headlight condensation: Symptoms include moisture buildup inside the headlight lenses. Solution: Replace the affected headlight assembly. Estimated Cost to Fix: $500 - $1,000 per assembly
• Roof panel noise: Symptoms include creaking, rattling, or wind noise from the panoramic roof panel. Solution: Adjust or replace the roof panel components as needed. Estimated Cost to Fix: $500 - $1,500

Interior

• Dashboard rattle: Symptoms include a rattling sound coming from the dashboard area. Solution: Disassemble and reassemble the dashboard to identify and tighten loose components. Estimated Cost to Fix: $200 - $500
• Trim panel fitment issues: Symptoms include misaligned or loose trim panels. Solution: Realign or replace the affected trim panels. Estimated Cost to Fix: $100 - $300

Recalls:

• 2011 Mercedes-Benz S400 Recall: Windshield Wiper Motor Failure (Recall ID: 12V427000)
• 2011 Mercedes-Benz S400 Recall: Power Steering Fluid Leak (Recall ID: 12V164000)
• 2011 Mercedes-Benz S400 Recall: Engine Coolant Leak (Recall ID: 12V014000)

Summary: The 2011 Mercedes-Benz S400 is a well-equipped luxury sedan with potential reliability issues. The most common problems are related to the engine, transmission, and electrical system. While some repairs can be minor, others can be costly. Potential buyers and owners should be aware of these issues and consider budgeting for potential repairs.